Diego Costa is thriving under Guus Hiddink but Eden Hazard is still struggling. We look at the pairs contrasting fortunes under the Dutchman...Diego Costas fine finish against Paris Saint-Germain on Wednesday night may have been in vain but it was a further example of the forwards return to form under Guus Hiddink.Costas first-half strike was his 11th in 15 games under the Dutchman. Thats some improvement on his return of four in 21 before Hiddinks arrival. However, while Costa is heading back to his best, Eden Hazard continues to struggle and was booed from the field by some Chelsea fans.The pair were key figures in Chelseas march to the title last season and both slumped at the start of this campaign, as Jose Mourinhos champions made the worst-ever start to a Premier League defence.But while Costa has driven himself out of his bad run of form through his typical mix of belligerence and brilliance, his Belgian team-mate seems stuck. Costa before/under Hiddink - 2015/16 Premier League Before Hiddink Under Hiddink Games played 14 10 Goals per game 0.21 0.8 Assists per game 0.07 0.4 Total shots per game 1.50 2.7 Chances created per game 1 1 Shot conversion rate % 14.29 29.63 Hazard before/under Hiddink - 2015/16 Premier League Before Hiddink Under Hiddink Games played 16 10 Goals 0 0 Assists per game 0.13 0.1 Total shots per game 0.94 0.3 Chances created per game 2.75 1.2 In Hiddinks first game in charge, a 2-2 draw with Watford, Costa scored twice. It set the tone and, since the change of management, the Spaniard has scored more goals, made more assists and increased the rate at which hes shooting, creating chances and putting away his opportunities in the Premier League.Over the past three-and-a-half months Costa has hounded and harried defenders, thrown himself into physical battles and rolled up his sleeves to turn his and Chelseas fortunes around. The sight of him pulling off his protective mask and tossing it away against PSG summed up his spirit. Diego Costa has scored 11 in 15 under Hiddink Im very proud of him, the way hes playing and, going not over the edge, but he likes to fight in the real way of the game, Hiddink said ahead of the last-16 second leg.Thats what we like. I protect him and support him when hes doing what he has done in my period at Chelsea. In the Premier League he frequently is scoring now, since December, January. Its difficult to put a brake on him. Costa wants to play every game, but I must be careful with that. Who am I to stop this man? We must let him go, but sometimes I have to put on a leash. Guus Hiddink on Diego Costas desire Theres been no such improvement in Hazards statistics. In fact, last seasons player of the year has seen his numbers in key attacking categories drop since Hiddinks arrival.The 25-year-old has had groin and hip problems this term but hes still played 34 times in the Premier League and Champions League. His return has been a meagre four assists and no goals. Hazards goal drought Eden Hazard has two goals for Chelsea this season, scoring in FA Cup wins over Championship side MK Dons and a much-changed Man City. Of course, Hazard is not a bruising, all-action battler like Costa. Thats not his style. But, aside from his struggles for form, half-time shirt swapping with Angel Di Maria and telling the French press he would struggle to refuse advances from PSG have done little to win him sympathy with the Chelsea support. Ivanovic defends booed Hazard Branislav Ivanovic has leapt to Eden Hazards defence after fans turned on the Belgian Missing the decisive penalty in Chelseas Capital One Cup shoot-out defeat to Stoke was forgiveable. So, too, perhaps, is a young players failure to match the extremely high standards he set last year.But, in changing shirts with Di Maria in the midst of Chelseas desperate bid to save their season, it feels like Hazards latest PR slip-up was one step too far. I think its a joke, Tony Cottee told Sky Sports News HQ. Its not the first time weve seen it - hes not the only player to have done it. But clubs issue rules at the start of the season about all sorts of things you can and cant do. Surely one of them should be that you do not swap shirts at half-time.Its an insult to the Chelsea fans. Its not even as if hes done it in the tunnel. Its blatant in front of everyone. Im a big fan of Hazard when hes playing well - which he hasnt been this year. Its an insult to the Chelsea fans. Im a big fan of Hazard when hes playing well - which he hasnt been this year. Tony Cottee on Hazards half-time shirt swap Fellow pundit Tony Gale is adamant Hazard wants away - but his numbers this season are hardly those of a player Real Madrid, PSG or other European heavyweights would normally chase.Perhaps Hazard should take a look at team-mate Costa for an example of how to turn his struggles around. Can Eden Hazard recapture the form we saw last season? Let us know using the message boards or by tweeting @SkyFootballAlso See:Ivanovic defends HazardFans had right to boo HazardChelsea statsGet a free £10 betJamaal Wilkes Lakers Jersey . On Saturday night, the normally free throw-challenged centre did just that. Howard scored 18 of his 25 points in the fourth quarter, including 13 of 19 free throws in a 2 1/2-minute stretch, and the Houston Rockets beat the Denver Nuggets 122-111. 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He finished a disappointing campaign just 14-13 with a career-worst 4.Dale Earnhardt Jr. wont race in 2016, and his continued absence will bring many questions about not only his own future but the future of his team.It doesnt end there. The absence of this kind of star even draws questions about NASCAR in general, even though it has worked hard not to rely on Earnhardt -- the winner of the most popular driver award in each of the past 13 years -- as the sole face of the sport.Dale is definitely a leader in our sport, said Elliott Sadler, who drives for a team co-owned by Earnhardt in the Xfinity Series. He is one of the good guys. Hes one of the blue-collar guys, down-to-earth guys, the guy who tells it like it is.He is one of the true grit racers in our sport and always has been.Earnhardt can continue to be a leader in the sport. Many have praised him for making the decision to get out of the car, but he will also point out he didnt feel there was any way he could race in the condition hes in. He also has, through social media, showed fans what some of his rehab entails.For Earnhardt, he will have to balance any risks to coming back versus his desire to race. The emphatic answers he gave last month when asked about retirement -- bolstered by the resurgence in his career the past five years that has seemed to reinvigorate him -- show he desperately wants to race again.His contract runs through next season, and he had talked about an extension with team owner Rick Hendrick. Many in the sport believed that extension would likely be Earnhardts last, that he would race well into his mid-40s (he turns 42 in October) and then hang it up.His team will work with a couple of drivers the remainder of the year. Four-time Sprint Cup champion Jeff Gordon will do four more races, including this weekend at Darlington. He will run at tracks hes traditionally strong at -- Richmond, Dover and Martinsville.Alex Bowman will run the rest, giving the 23-year-old several opportunities to show what he can do and get comfortable in the car.The team now goes into this stretch knowing it could win only what is called the owners championship. It really is a team title, and it means much more to teams than it does to the public. But the bonus money is the same to the team as it is for who wins the driver title.Crew chief Greg Ives said the motivation for the Hendrick No. 88 team comes from wanting to run well. His team sits 15 points outside the final spot in the owner version of its Chase with two races left in the regular season.Every point I can get on the racetrack drives me, Ives said. The pride is being able to finish races and get as many points as possible.The health of our driver is No. 1. ... To be able to strive through [some mechanical issues] annd still be 15th in points and know we have to get a couple more to be able to ensure a potential owners championship, that drives us with a little bit of a spark.dddddddddddd.Ives doesnt worry that his crew might want to leave if Earnhardt cant return. He said the atmosphere at Hendrick Motorsports -- where the Earnhardt and Jimmie Johnson teams share a shop -- creates more of a sense of working for the company than a specific driver.I dont think anybody is forecasting that far ahead, Ives said. For me, I know Im not. ... Its just one of those things where we keep going, keep working hard.Its not just Earnhardts Sprint Cup team that is affected. Other drivers, if they have concussions, will see what Earnhardt did and be encouraged to follow a similar path. But drivers with less secure sponsorship and rides still could feel pressure to race while injured.Drivers know they compete in a dangerous sport. And despite how much work goes into safety, they tend to put a lot of their future up to fate.Time will tell, Joey Logano said about Earnhardts return. Im not going to be the guy thats going to be able to answer that question for you.All I can say is hes in our thoughts and our prayers and either way Gods got a plan for him and it will work out, but a lot of the time you dont know Gods plan until it happens.There also is the challenge for the sport in having its most popular driver absent.Attendance and ratings dont seem to have been affected yet by his absence -- tracks with expected sluggish sales have been sluggish -- but now that fans know he wont be at their track, there certainly is at least mild concern throughout the sport.The first track that comes to mind is Talladega, where ticket sales since Earnhardts announcement have not shown an impact, according to a spokesman.NASCAR has tried to push its younger drivers into the limelight. The 26-and-under drivers include Logano, Kyle Larson, Austin Dillon, Chase Elliott, Ryan Blaney and Chris Buescher.The elimination-style Chase format introduced in 2014 also has added drama to the final 10 weeks of the season.When Dale Jr. is the most popular driver in our sport and you dont show up to the track for two or three weeks, not that you are forgotten, but its crazy how things move on,?Jamie McMurray?said.I dont know that any of us knew what to expect or how that was going to go, but I dont know how to say that and to be, like, correct. ... He is iconic and he is obviously the most popular guy, but it will move on and it will continue to be a great form of auto racing in the United States. ' ' '