。
He held a shutout through nine innings.
Literal
He [topic-は] 9 innings [until-まで] shutout [to-に] held.
９回まで ('through 9 innings') uses the counter 回 for baseball innings. シャットアウト is the English loan. 抑えた (おさえた, 'held down, suppressed') is the baseball term for a pitcher keeping the opposition scoreless. に抑えた ('held to') specifies the result. Concise sports reporting.