LONDON (REUTERS) - Sabine Lisicki's love affair with grass continued to blossom, as she reached the Wimbledon quarter-finals for the fourth year running with a 6-3, 3-6, 6-4 win over Kazakhstan's Yaroslava Shvedova on Tuesday.

For 50 weeks of the year, the 24-year-old German seems to get lost in the crowd by producing one non-descript performance after another.

But come Wimbledon fortnight and the 2013 runner-up morphs into a world beater and has now reached at least the quarter-finals in each of her last five appearances, having missed the 2010 tournament through injury.

The 19th seed raised a few alarms within her camp on day eight of the championships when she took a medical time out at 1-1 in the third set. Lying flat on her stomach on Court Three, her back and shoulder was massaged and brought back to life by the tournament trainer.

Although she received further treatment during the changeovers, she maintained her focus and wrapped up victory on her third match point when Shvedova netted a forehand.

Lisicki celebrated by shrieking and falling to her knees in delight and will next face French Open runner-up Simona Halep for a place in the semi-finals.