Novak Djokovic faces Britains Kyle Edmund and Roger Federer also starts his title challenge on Fridays packed schedule at the Miami Open. Djokovic, the defending champion, will take on Edmund in the second round, with the match scheduled to take place at midnight, live on Sky Sports.The 21-year-old secured his first ever match against the world No 1 after a battling three-set win over Jiri Vesely in the first round. Edmund has shown he can handle the big stage while playing in the Davis Cup Djokovic retained his trophy at Indian Wells last week, defeating Milos Raonic in straight sets, and has won four of the last five tournaments in Miami.But Edmund has performed creditably on the big stage before as he extended world No 15 David Goffin to five sets in a battling singles defeat in last years Davis Cup final. Tough comeback for Fed Roger Federer is fit again after undergoing knee surgery Federer will make his comeback from a knee injury when he plays a tricky opening match against Juan Martin Del Potro.The Swiss was forced to undergo surgery after injuring himself while preparing a bath for his daughters, but has quickly returned to fitness.The 17-time Grand Slam winner will need to be match sharp against Del Potro, a former US open champion, who himself has overcome injury problems.Federer has 15 wins from his previous 20 matches against Del Potro, but the pair have not shared the court since the world No 3s victory at the 2013 ATP Tour finals.Best of the rest Dominic Thiem is one of the sports upcoming talents Seventh seed Tomas Berdych takes on American Rajeev Ram, while eighth-seeded David Ferrer has been pitted against another home hope, qualifier Taylor Fritz.Exciting youngster Dominic Thiem, Richard Gasquet, Marin Cilic and Goffin are part of a packed schedule in Florida.Possible upset? Albert Ramos-Vinolas is a potentially tough foe for Richard Gasquet If Federer is short of fitness then he could struggle at first against Del Potro, but should find a way past the towering Argentine.Albert Ramos-Vinolas has performed well this year, reaching a tour semi-final, and he claimed an upset win over Nick Kyrgios at Indian Wells.The Spaniard is capable of pulling off another surprise result against Frenchman Gasquet.Brit interest Johanna Konta can follow Heather Watson into the third round British No 1 Johanna Konta has been drawn against Danka Kovinic in the second round of the womens event.Konta will be hoping to join Heather Watson, who has already reached the third round with a straight sets win over 20th seeded Sloane Stephens.By purchasing a Sky Sports Day Pass for £6.99 or Sky Sports Week Pass for £10.99, you can enjoy access to all seven Sky Sports channels and watch on a TV with a NOW TV Box or on a range of devices. 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Vokoun departed practice on Saturday morning after discovering swelling in his thigh. He was taken to a local hospital where the clot was revealed. The club announced the surgery following a 5-3 exhibition loss to the Columbus Blue Jackets. CHICAGO -- Paul Goldschmidt cleared his head after being overpowered by Jeff Samardzija in his first three at-bats. Goldschmidt hit a tiebreaking grand slam in the eighth inning, leading the Arizona Diamondbacks to a 12-4 victory over the Chicago Cubs on Saturday night. Arizona starter Ian Kennedy (3-3) allowed four runs on three hits in seven innings and retired 20 of the final 21 batters he faced to help end Chicagos five-game winning streak. Gerardo Parra led the game off with a home run and Jason Kubel hit a bases-clearing double in the seventh inning for the Diamondbacks, who won for just the second time in 12 games at Wrigley Field. Nate Schierholtz hit a solo shot and an RBI double, but the Chicago bullpen couldnt hold a 3-1 lead for Samardzija, who was relieved after throwing 115 pitches. With the scored tied at 4 in the eighth inning, Parra hit what looked to be a go-ahead RBI double off Cubs reliever Carlos Marmol (2-3), but the ball got stuck in the ivy in the centre field wall, resulting in a ground-rule double. Willie Bloomquist, who was running on the pitch and wouldve easily scored from first, was sent back to third base. After a walk to load the bases, Goldschmidt hit a long shot off Marmols slider to centre field for his first career grand slam, giving the Diamondbacks an 8-4 lead. Goldschmidt struck out in his first three at-bats against Samardzija. "You can have three bad ABs, I dont even know if that qualifies as bad ABs. Samardzijas stuff was really good, but you get a chance to win the game in the eighth or ninth you cant live in the past," Goldschmidt said. "Its a game of failure. Its what the game is all about." Diamondbacks manager Kirk Gibson knows the feeling of rebounding after a few bad at-bats. "You are there, you are striking out, the fans are yelling at you, youre disappointed that youre letting the team down, but it is a great feeling when you come through. It happened to me many times," Gibson said. The Diamondbacks scored a season-high 12 runs and had a season-high 17 hits. Trailing 3-1 in the seventh inning, Goldschmidt worked a walk against Samardzija to put runners on first and second and end Samardzijas outing. After retiring the first batter he faced for the second out, Cubs reliever James Russell walked Martin Prado, and Kubel followed with a double to clear the bases and give Arizona a 4-3 lead. "One thing we did good against him we got his pitch count up. Then we got into their bullpen we got some big hits and won the game," Gibson said. After retirinng 17 straight batters, Kennedy was tagged by Schierholtz for a home run leading off the bottom of the seventh.dddddddddddd. It was Schierholtzs seventh of season. "It was probably only the second time I shook off Miggy (Miguel Montero) all game. He called a great game," said Kennedy. "It was one of those things, Gosh darn it, I should have stayed with it." Samardzija showed flashes of his dominant performance against the White Sox on Monday, but was pitching in and out of trouble most of the night. He allowed three runs and seven hits, while striking out 11 and walking three. In his previous outing against the White Sox, he pitched a two-hitter while striking out eight. The Cubs bullpen gave an up nine runs and 10 hits with four walks in 2 2-3 innings. "The bottom line is, you walk eight guys, youre not going to win too many games, no matter what, when you walk eight guys. It basically came down to the walks. Obviously they got a couple big hits to bust the game open. But the walks were the difference in the game," Cubs manager Dale Sveum said. After a 2-hour, 21-minute rain delay, Parra led off the game with a home run to right. It was the fourth time in his career he led off a game with a home run and it was his fifth of the season. "Theyre a fastball-hitting team, theyre really aggressive. I knew they were on it, especially after Parras first at-bat, so I started making better pitches. Used my slider to get ahead in the count and kind of got back on track there. Splitter was good. Just avoid those walks in the seventh," Samardzija said. With no outs in the first inning, the Cubs loaded the bases. David DeJesus scored on Alfonso Sorianos sacrifice fly then Schierholtz hit an RBI double down the right field line. Anthony Rizzo scored on Welington Castillos ground out to give the Cubs a 3-1 lead. Sveum was ejected by home plate umpire Joe West in the second inning after arguing a close call at first base. It was his second ejection of the season. Kennedy was back on the mound after missing his last start because he cut his right index finger while washing a knife. NOTES: Arizona 3B Eric Chavez is expected to miss two to three weeks after an MRI revealed a minor tear of his right oblique muscle. ... Diamondbacks placed RHP Brandon McCarthy on the disabled list Saturday because of right shoulder inflammation and recalled RHP Randall Delgado from Triple-A Reno. ... In his first game of the season, Bloomquist was 3 for 4. He was activated from the DL on Friday with an oblique injury. ' ' '