Japan's Hideki Matsuyama, who captured his first U.S. tour title at The Memorial on June 1, expressed confidence in his preparations a day ahead of the opening round of the PGA Championship at Valhalla Golf Club.Japan's Hideki Matsuyama, who captured his first U.S. tour title at The Memorial on June 1, expressed confidence in his preparations a day ahead of the opening round of the PGA Championship at Valhalla Golf Club.