LAS VEGAS -- Middleweight champion Chris Weidman has a knee injury, forcing the UFC to postpone his title bout against Lyoto Machida for six weeks. The UFC announced the changes to two major Las Vegas shows on Monday. Weidman (11-0) was expected to make his second title defence at UFC 173 on May 24 at the MGM Grand Garden, but the Long Island-based mixed martial artist needs minor surgery. Weidmans bout with Machida is moving to UFC 175 on July 5 at the Mandalay Bay Events Center. The UFC hasnt decided on a new main event for its traditional Memorial Day weekend show. Former heavyweight champion Junior Dos Santos will meet Stipe Miocic in the top undercard fight on the pay-per-view event. Weidman claimed the 185-pound title when he stopped long-reigning champion Anderson Silva in the second round last July. He defended the belt in December when Silva broke his leg in their rematch. Weidman is the fourth champion in the UFCs seven mens weight classes currently sidelined for surgery, although his recovery is expected to be the shortest. Heavyweight champion Cain Velasquez had shoulder surgery in December, and isnt expected to return to the octagon until late this year. Lightweight champion Anthony Pettis has been out since last August following knee surgery, and is hoping for a late-summer return. And welterweight champion Johny Hendricks is likely out until fall after tearing his right biceps muscle two weeks before his victory over Robbie Lawler this month. Machida (21-4), the former UFC light heavyweight champion, got this middleweight title shot after Vitor Belfort was removed from the card in late February when the Nevada Athletic Commission banned the use of testosterone replacement therapy. Belfort was among MMAs most prominent sanctioned steroid users, but has decided to give up the practice. 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Next up for the Wimbledon runner-up will be Slovenian Polona Hercog, who outlasted Czech Petra Cetkovska 6-4, 5-7, 6-1.Durham, NC (SportsNetwork.com) - Following an 11-day layoff, the Duke Blue Devils get back to work on Monday evening, as they play host to the Elon Phoenix in a non-conference matchup at Cameron Indoor Stadium. Mike Krzyzewskis Blue Devils are a flawless 8-0 on the season and have a couple of marquee victories under their belt already, topping Michigan State (81-71) back on Nov. 18 and most recently, dispatching top-five foe Wisconsin (80-70) in Madison on Dec. 3 as part of the ACC/Big Ten Challenge. Making things even more daunting for Elon is the fact that Duke has won an NCAA-best 113 straight games at home against non-conference opponents. Matt Mathenys Phoenix are hovering just over the .500 mark at 5-4. The team has eclipsed the 100-point mark in two of its last three games, but had a three-game win streak snapped with a 78-73 road loss at Missouri last week. This game marks the second leg of a four-game road trip for Elon which will travel to UNC Greensboro and Kennesaw State before the Christmas holiday. Duke holds a 16-5 edge in the all-time series with Elon and has won six straight meetings, including an 86-48 rout last year on New Years Eve. The Phoenix are shooting a modest .434 from the floor overall, but are averaging almost eight 3-pointers per game and 14 made free throws, resulting in a strong scoring average of 77.9 ppg. Luke Eddy has started just two of the nine games thus far, but has shot the ball extremely well (.545 overall, .500 from 3-point range) leading to a team-best 13.6 ppg. Tanner Samson is a close second in the scoring column at 13.3 ppg thanks mostly to his ability to knock down the 3-pointer. The 6-foot-4 Samson is shooting .442 from long range and is responsible for 34 of the teams 71 ttreys on the year.dddddddddddd Elijah Bryant has come off the bench in every game, but is a key contributor with 11.4 ppg. The Phoenix trailed by as many as 19 points to Missouri last time out, but came roaring back to within one point in the second half, before losing by five. Eddy was the driving force in the comeback bid and finished with a game- high 27 points, going 8-of-15 from the floor and 8-of-8 from the free-throw line. Kevin Blake added 14 points and Samson finished with 10 for Elon, which shot just .358 from the floor overall. The Blue Devils dont find themselves playing from behind often, as they have been the squad putting opponents away with big runs. In the double-digit road win at Wisconsin last time out, Duke had four players finish in double figures, led by freshman point guard Tyus Jones 22 points. Junior Rasheed Sulaimon added 14 points off the bench while freshman Jahlil Okafor and senior Quinn Cook finished things off with 13 points apiece. Duke is getting it done at both ends of the court and as a result, boasts of the nations second-best scoring margin at a hefty +28.6. The team has been highly efficient offensively, ranking third nationally in both scoring (89.1 ppg) and field-goal percentage (.539), while also living comfortably in terms of rebounding (+8.8) and turnover (+4.8) margins. Okafor came into the season as the nations top recruit and has certainly lived up to his billing. The young 7-footer is shooting a scorching .646 from the floor and is averaging 17.1 points and 7.6 rebounds per game. Cook is next in line at 15.3 ppg and tops the team with 23 3-pointers to date. Freshmen Justise Winslow (12.0 ppg) and Jones (10.5 ppg, 5.8 apg) have made immediate impacts as well. ' ' '