Last year, in ATP events alone, there were 542 in-competition tests and 50 out-of-competition screenings.

He was Spanish junior champion in 2007 and played in an ATP 250 event in 2011.

In the same period, Roddick has won eight ATP events and no major titles.

He pulled out of his next ATP event, in Los Angeles, citing a sore right knee.

He recalled last year's triumph, his first in an ATP event.

Roddick's first ATP event of the year was the Australian Open.

He drew strong opponents in all three ATP events.

It was only in its final three years that the tournament was once again an ATP event and played on hardcourts.

This is the 24th straight tournament Sampras has failed to win, the longest drought since he won his first ATP event in 1990.

He had success in 2007 playing at all levels of the tennis tour: Futures, Challenger, and ATP events.