Young American Jack Sock stunned in-form World No 14 Milos Raonic with a 6-3, 5-7, 7-5 victory to provide the first major upset of the Memphis International tournament on Wednesday.
Top seed John Isner narrowly avoided a second straight first round exit as the big serving American edged past Canadian Jessie Levine 7-6, 5-7, 6-4 at the Delray Beach International on Tuesday.
Japan's Kei Nishikori wrapped up a straight sets win over Feliciano Lopez to win the Memphis International on Sunday.
Top-seeded Marin Cilic saved three match points to narrowly avoid becoming the latest upset at the Memphis International tournament on Thursday.
Marin Cilic struggled early before finding his rhythm as the top seed ground out a 4-6, 6-2, 6-3 victory over friend and Croatian compatriot Ivan Dodig in the first round of the Memphis International on Monday.
Top seed Venus Williams was stunned in the first round of the Memphis International by Czech qualifier Petra Kvitova.
Venus Williams battled past fellow American Laura Granville 7-6, 6-4 to reach the Memphis International semi-finals
The German produced a stunning performance to win the Memphis International for the third time.
The American has targeted a return to the world's top 16 by the French Open.
Andy Roddick has pounded down 56 aces this week, while Tommy Haas has yet to even face a single break point.
The seventh-seeded American next plays top seed Shahar Peer of Israel at the Memphis International.
Andy Roddick and Andy Murray eased into the quarterfinal of the Memphis International.
Top seed Andy Roddick and number three Andy Murray reached the Memphis International second round in contrasting styles.
The American continued her comeback from injury with a 6-4, 6-4 win over 16-year-old Dane Caroline Wozniacki.
The former world number one beat Japan's Akiko Morigami 6-1, 2-6, 6-4 in the first round of the Memphis International.
Top seed Andy Roddick survived a battle against Yen-Hsun Lu of Taiwan on Friday to set up a mouthwatering semi-final clash with Andy Murray at the Memphis International.