Matsuyama pulled out of the tournament in San Antonio after playing nine holes in the second round. He shot a two-over par 74 in round one and had played the back nine in one under in round two before he decided to pull out.

The 30-year-old became the first male Japanese player to win a major championship when he took the Masters Green Jacket last year, beating America's Will Zalatoris by one stroke.

Matsuyama's appearance at the Valero Texas Open was his first since finishing in a tie for 20th place at the Arnold Palmer Invitational in March.

The world No 12 withdrew from the Players Championship with a lingering back injury and also opted out of the WGC-Dell Technologies Match Play.

Speaking last week about his fitness during a conference call organised by Masters officials, Matsuyama said: "I've been receiving a lot of treatment, getting prepared. I'll do my best to prepare well so I can defend my title at Augusta.

"I haven't been able to practise as much as I'd like but what I have been doing I feel like I'm on the right track. Hopefully I can find the same form that I started the year with.

"Going to the Masters is something very special for me and something I've really been looking forward to so I'm going to do my very best to be as prepared as I can to defend my title there."

Matsuyama began the year with victory at the Sony Open in Hawaii and a top-10 finish at the WM Phoenix Open.

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