Jamie Hampton is ranked a career-best No. 41 in the world after reaching the fourth round of the French Open.
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EASTBOURNE, England (AP) -- American qualifier Jamie Hampton upset top-seeded Agnieszka Radwanska, 7-6 (2), 6-2, Tuesday in the first round at Eastbourne.
Radwanska, who won the title in 2008, struggled throughout the match at the Wimbledon warm-up tournament.
Although Radwanska tied it 5-5 when Hampton served for the first set and held a set point at 6-5, she was overwhelmed in the tiebreak and failed to rally in the second set.
The 41st-ranked Hampton maintained her composure when No. 4 Radwanska rallied late in the first set.
"I was a little rattled, yeah,'' Hampton said. "Last time we played something similar happened, so I was like, 'I'm not going to crack. I'm going to hold on and get to a tiebreak.'''
Radwanska said she's still adjusting to the grass after the clay-court season.
"Playing her in the first match on the grass, I think it was tough,'' Radwanska said. "The fact that she played three matches before helped her a little bit."