Laura Robson booked her place in the second round of Wimbledon after securing a 6-3 6-4 victory over 10th seed Maria Kirilenko.
Despite facing a player ranked 28 places above her the 19-year-old was in control from start to finish, barring a nervous wobble in the closing stages.
The victory means Robson is just the second British player in either draw to progress beyond the opening round, with Andy Murray the only other home player to win.
Robson's tussle against the experienced Kirilenko looked difficult on paper, but she soon started to dominate the opening set on Court One, where she won the girls' title five years ago.
Both players traded blows from the baseline with Robson putting on the pressure before finally making the breakthrough in the eighth game.
The Brit returned a powerful forehand to earn two break points and grasped the first one available, hitting a sweet cross-court stroke to leave herself serving for the set.
Robson showed no sign of nerves, smashing down a 109mph ace before wrapping up the set when Kirilenko sent a forehand return beyond the base line.
The home hope continued her domination early in the second set, converting a break point with a neat backhand winner before holding to love to go 3-1 up.
She squandered three chances to move two breaks up in the fifth game but she fashioned another break-point opportunity, this time sending down a powerful one-handed forehand winner.
But the nerves then started to show as she double-faulted on her way to losing her serve for the first time in the match.
Robson then took a tense eighth game despite an early double fault and held back the nerves to clinch the first match point available with another aggressive forehand. She will play Mariana Duque Marino in the next round.
British No 5 Tara Moore was not so fortunate as she went down 7-5 5-7 7-5 in two hours and 34 minutes against Kaia Kanepi of Estonia.
Moore required treatment on a knee injury at the start of the deciding set and promptly slipped 4-1 behind. However she rallied to break back twice to give home fans renewed hope before Kanepi broke again before serving out the match.
The defeat means Robson is the only British hope remaining in the women's draw.