Kerber has never made it out of the round-robin portion

ST. LOUIS -- The St. Louis Cardinals have placed Michael Wacha on the 15-day disabled list with shoulder inflammation, a day after his latest start, and purchased the contract of top prospect Alex Reyes from Triple-A Memphis.To make room for Reyes, catcher Brayan Pena (left knee) was transferred from the 15-day DL to the 60-day DL.The 21-year-old Reyes started for the World Team at the Futures Game during All-Star week and is 2-3 with a 4.96 ERA in 14 starts and 93 strikeouts in 65 1/3 innings. The start of his season was delayed by a 50-game suspension after he tested positive for marijuana use.Reyes is 20-21 with a 3.50 ERA in 69 career minor league starts.Wacha is 7-7 with a 4.45 ERA. He allowed four runs in five innings and got no decision in a 5-4 come-from-behind victory on Monday. Custom Jerseys From China . 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The air went out of the WTA balloon shortly after the US Open, when Serena Williams announced that she would play no more tour events until the WTA Finals in Singapore. The decision all but conceded the prized year-end No. 1 ranking to the woman who deposed Williams at the top, No. 1 ranked Angelique Kerber.Now the balloon is inflated again, and dancing in the breeze, thanks to Kerbers failure to clamp down on her rivals in the weeks since the US Open.Had Kerber improved upon her solid but unspectacular results of last year this fall, she would be in position to clinch the top spot for 2016 before the start of Singapore. It was a reasonable assignment for a newly empowered player who took a quantum leap in 2016, winning two Grand Slam events. But Kerber faltered. Shes now involved in a two-person race with a rival whos still relaxing back home.Kerber will lose ground (95 points) when the rankings are issued Monday, because she was beaten one round sooner this year than last in Beijing. She will have 8,390 points, a lead of 1,340 points. The undefeated winner of the WTA finals earns 1500 points, so Williams clearly will have a shot to displace Kerber because she has no points to defend, while Kerber can add points but also has some coming off as the weeks end.As of now, Kerber could lose the coveted top ranking on the last day of the WTA season. In fact, right now she could only lose it on the final day of play in Singapore, as Williams would need to make at least the final to regain No. 1.Stranger things have happened. Remember, this is Serena Williams we are talking about.In fairness, Kerber hasnt found much favor with the draw gods this fall. She took a bruising, three-set third-round loss against Petra Kvitova in Wuhan just as the Czech was roaring back from her recent slump. In Beijing, Kerber was knocked out in the third round as well, this time by emerging giant killer No. 19 Elina Svitolina. The erratic but dangerous 22-year-old Ukrainian also bounced Williams from the Olympic Games a couple of months ago.Williams certainly has faced challenges comparable to this one. You can be sure Kerber is already hearing footsteps, and thats not going to make her life any easier at the final tournament on her schedule next week in Hong Kong.ddddddddddddShe was a finalist there last year, so shell have to win the event outright in order to add insurance points to her ranking.Kerber can add 100 points if she wins Hong Kong, which will also feature Venus Williams, Caroline Wozniacki, Sam Stosur and Alize Cornet. Anything less than a final for Kerber and she loses points with Williams gaining some precious breathing room.The current ranking system can actually give players a delayed reward for poor performances. Kerber has never made it out of the round-robin portion of the WTA Finals in three trips (shes won just two single matches). Last year, she won one match and will be defending just 370 points.No matter how you cut it, Williams has very little wiggle room -- but there is room after the latest turn of events in Beijing.Williams decision to return for the WTA Finals always seemed more like a tour-related obligation rather than a legacy-building opportunity. Had Kerber clinched the top ranking, Williams might have gone into the finals relaxed and happy to hit a few balls and pick up a kings ransom in prize money. After all, she left the tour in order to get healthy for 2017, not to train like mad to make a final push at Singapore. Its also clear that Williams has been enjoying life, as her Twitter feed and videos -- like the most recent one of her salsa dancing -- confirm.But if she goes into the WTA Finals with a chance to win back the No. 1 ranking, the vibe in Singapore changes. The tournament will matter. Whether Williams likes it or not, Singapore becomes the third potential showdown on a big stage with Kerber. Then the question becomes, how prepared is Williams?Thats where the difference in their WTA Finals records might come into play. Williams is 29-6 (five titles), while is just Kerber, 2-7. But given Kerbers lead in rankings points, even that might not be enough. ' ' '