Heather Watson enjoyed one of the best wins of her career on Monday by overcoming Germany's Sabine Lisicki in the opening round of the Toray Pan Pacific Open.

Watson, who had not won a match on the main tour since the London Olympics, triumphed 6-4 7-6 (7/3) in Tokyo.

Lisicki, who has slipped to number 30 in the world rankings from a career-high 12 in May, conceded a solitary break of serve in the opening set and was unable to hit back on the four opportunities she created. The second set went to a tie-breaker, which the 20-year-old from Guernsey won to set up a second-round clash with former world number one Maria Sharapova.