Wataru Matsumoto worked five innings to win his pro debut for the Saitama Seibu Lions in a 9-3 Pacific League victory over the Orix Buffaloes on Sunday.
The 22-year-old Matsumoto, the Lions' first pick in last autumn's draft, allowed two runs on four hits and two walks, while striking out one at Kyocera Dome.
The Lions opened the scoring with some tenacious batting against first-year right-hander Tyler Eppler (0-2), who gave up three runs over 3⅔ innings. Seibu catcher Tomoya Mori went 3-for-5 with a double and a seventh-inning grand slam to put the game away.