CHICAGO -- The Chicago Cubs are proving to be one difficult assignment for contending teams hoping to improve their playoff position. Jake Arrieta pitched six solid innings and Chicago beat Milwaukee 7-1 on Tuesday night, handing the Brewers their seventh consecutive loss. The last-place Cubs will try for a series sweep of the Brewers on Wednesday night. They are 18-14 since Aug. 1, including a sweep of AL East-leading Baltimore and two of three in a series at NL West-leading Los Angeles. "Were figuring out ways to put all the facets of the game together at the same time," Arrieta said. "Thats what really good teams do." Arrieta (8-5) allowed one run and five hits, struck out four and walked two. He has allowed one or no runs in 13 of his 22 starts this season. Shortstop Elian Herrera made two errors that helped the Cubs score four runs in the first inning, and Milwaukee stranded a runner in scoring position in five of the nine innings. Since owning a 2 1/2-game lead in the NL Central on Aug. 19, the Brewers have lost 10 of 12. "We have to get back to the way we played the majority of the first five months," slugger Ryan Braun said. "Every team has a bad week. Its not an ideal time for it to happen to us. But we have to go out there and continue to compete every day, and it will turn around at some point." Milwaukees Yovani Gallardo (8-8) allowed a season-high seven runs and eight hits in five innings. Jorge Soler and Luis Valbuena each singled in a run in the first and came around to score on Herreras errors. Braun singled home Scooter Gennett in the third, but the Cubs pulled away again in the fifth. Welington Castillo had an RBI double and Arismendy Alcantara connected for a two-run homer, extending the Cubs lead to 7-1. "Everybody chipped away, made some things happen," Cubs manager Rick Renteria said. "We took advantage of their mistakes." Alcantara, who made his big league debut earlier this season, now has eight home runs through 50 games. Valbuena got two hits and scored twice. Over his past 17 games, he has hit six homers, driven in 10 runs and scored 12. Cubs shortstop Starlin Castro sprained his left ankle on an awkward slide home in the first inning, and left the game. Initial tests revealed no fracture for the three-time All-Star. TRAINERS ROOM Brewers: OF Carlos Gomez was diagnosed with a sprained left wrist and will not swing a bat for at least one week, manager Ron Roenicke said. The injury could potentially sideline the two-time All-Star for a few weeks, but Roenicke said Gomez will remain available as a pinch runner and defensive substitute. Cubs: All-Star 1B Anthony Rizzo was diagnosed with a back strain and will miss an extended period of time. Cubs executive Theo Epstein said the injury could be season-ending. UP NEXT The Brewers and Cubs finish their three-game set Wednesday night. RHP Kyle Hendricks (5-1, 1.91 ERA) starts for the Cubs, aiming to win his fifth consecutive decision. He will face RHP Matt Garza (7-7, 3.58 ERA), who makes his first start since being put on the 15-day disabled list with strained left oblique on Aug. 5. PRIZED PROSPECT Although the Cubs front office did not call 3B Kris Bryant up to the majors when rosters expanded this month, Epstein still had plenty of praise for the prize prospect. "Hes as advanced and mature and professional as a prospect weve had," Epstein said, before directing his focus at next season and adding, "If anyone can jump into the big league picture in the middle of the season and not miss a beat, its Kris Bryant." Matt Andriese Diamondbacks Jersey . Anaheim Ducks Reassign D Colby Robak to Norfolk Admirals (AHL). - Team Website D Eric Brewer (foot) removed from injured reserve. Abraham Almonte Jersey . Smith, an eighth overall pick, had two goals in only 276 minutes of playing time over 16 appearances last season. The left side midfielder played only 43 minutes in three games this season. http://www.diamondbackssale.com/diamondbacks-caleb-joseph-jersey/ .Y. - The New York Yankees made it official Saturday, announcing the completion of a seven-year deal with free-agent outfielder Jacoby Ellsbury and a one-year contract for returning starter Hiroki Kuroda. Rob Refsnyder Diamondbacks Jersey . Particularly when speaking in the stadium of Tuesdays opponent: Manchester City. "Maybe they dont fear us as before," Pique said on Monday, "because in the last two years we didnt win the Champions League. Jarrod Dyson Jersey . The San Angelo, Texas product, who was a high school and college quarterback sensation in the Lone Star State, will start his first CFL game with the Saskatchewan Roughriders (9-4) on Friday at Mosaic Stadium against the leagues top team, the Calgary Stampeders (11-2).The Grey Cup continues to be one of the biggest celebrations and television events in Canada, with Sunday nights 101st Grey Cup attracting an average audience of 4.5 million viewers on TSN. This ranks as the most-watched sports program of the broadcast year and the fourth most-watched Grey Cup on record, according to preliminary overnight data from BBM Canada. Overall, more than 11.5 million viewers, or approximately one in three Canadians, watched some part of the 2013 CFL championship on TSN and in French on RDS. The 101st Grey Cup saw the Saskatchewan Roughriders defeat the Hamilton Tiger-Cats 45-23 in front of a sea of green-clad Rider fans at Mosaic Stadium in Regina.dddddddddddd. Audience levels for the 101st Grey Cup peaked late in the second quarter, as 5.5 million viewers watched the Roughriders take a convincing 25-point lead over the Tiger-Cats. The stunt-filled performance by Canadian multi-platinum pop group Hedley during the SiriusXM Grey Cup Half-Time Show attracted an average audience of 4.2 million viewers. An average audience of 2 million viewers stayed to watch TSNs extensive post-game coverage. TSN s 101st Grey Cup pre-game broadcast also featured a sit-down interview between Brian Williams and surprise guests Tom Hanks and Martin Short. ' ' '