James Ward made it through to the second round of Wimbledon for the first time after he beat Spain's Pablo Andujar in five sets on Court 14.
Ward, who first caught the nation's attention when he reached the semi-finals at Queen's last summer, lost the first set, but battled back to win the second set to love.
Both players then won a set each before Ward clinched the decider, Britain's number two progressing to a second round meeting with Mardy Fish after a 4-6 6-0 3-6 6-3 6-3 win.
Ward squandered seven break points in the first set and Andujar needed just one, breaking the Londoner to move in front after 49 minutes.
The British number two hit back in style, wrapping up the second set to love after a little over 20 minutes, but the match swung back in Andujar's favour when he took the third.
Ward needed only one break point to clinch the fourth set, but he immediately found himself under pressure in the decider.
Andujar, who is ranked 36th in the world, burst in to a 3-0 lead but 25-year-old Ward won the next four games to move 4-3 ahead.
Things got heated towards the end of the set as both players questioned line calls, but Ward found his composure and broke his opponent again to seal the shock win.
"Of course this is the biggest win of my career," Ward said.
"Wimbledon is the biggest tournament in the world.
"Grass isn't Andujar's favourite surface, but he's 36 in the world and wins titles on clay for fun.
"He's a good player and he competes very well. He didn't give up on anything so it's a massive win."
There seems little hope of Jamie Baker pulling off the biggest shock of his career after Andy Roddick took control of his match against the Scot on Court One.
Baker, ranked 161 places below the American, started off confidently, but ended the day having lost the first set 7-6 (7/1) and 4-2 down in the second when rain fell at SW19, causing play to be halted.
Baker shocked his opponent by earning two break points in the first set, but he was unable to convert them, much to the disappointment of the partisan crowd who had gathered to cheer on the Glaswegian.
Roddick seemed rattled by his opponent's confident play, but he held on to force a tie-break.
It was then that three-time finalist Roddick moved in to top gear, breaking Baker twice after Britain's number three found the net with two unforced errors.
Both players fired down aces but Roddick won another break before serving out for the set with another unreturnable serve.
Roddick seized the initiative in the second set when he broke Baker at the third time of asking before the rain arrived.