German qualifier Denis Gremelmayr upset seventh-seeded Sam Querrey 5-7, 7-6 (1), 6-3 in the SAP Open first round on Tuesday.
Querrey reached the semifinals at Delray Beach, Florida last week but couldn't finish off the second set against Gremelmayr, who earned only his second win on the main tour in 12 months.
Another German, Benjamin Becker, ended a three-match losing streak by beating Marcos Daniel 6-1, 3-0 when the Brazilian retired with a groin injury.
Also, Robby Ginepri beat Jesse Witten 6-2, 5-7, 6-4 and Mardy Fish finished cruised past Tim Smyczek 6-3, 6-4 in all-American matches.

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