Scotland's Andy Murray is confident his injury troubles are behind him after stepping up his return from a back problem.
Murray had surgery last September after failing to retain his U.S. Open title. He lost in the quarterfinals to Stanislas Wawrinka.
Murray lost at the same stage to Roger Federer in this year's Australian Open. He reached the semifinals in last week's Mexican Open before losing to eventual winner Grigor Dimitrov.
Next up for Murray, who has slipped to world No. 6 following his absence, is the Indian Wells Masters, which he prepared for with a one-off exhibition defeat to Novak Djokovic at the weekend.
Despite that reverse to his long-time rival, Murray's confidence is building in a year that will see him defend the Wimbledon title he won last July.
"Coming back from surgery is always tough," the 26-year-old said.
"Winning Wimbledon was also very challenging mentally and afterwards I did feel quite flat.
"I was also having problems with my back so it was a decision whether to put up with it or get something done.
"I wanted to be pain free and be able to step out onto the practice court and enjoy it.
"I could have put up with it and let it get worse or got it sorted. The first few tournaments back were hard but my body feels good now.
"Last week in Acapulco I played four matches in four days, three three-set matches which didn't start until late, woke up the next day and felt fine for the first time since I had the surgery.
"That shows I am starting to recover properly which is great."