His performance has been inconsistent, and the coach is focusing on both his attitude in practice and his results in games.
こんにちは！
ご質問ありがとうございます。
ご質問について、いくつか言い方が考えられますが、例えば、
His performance has been inconsistent, and the coach is focusing on both his attitude in practice and his results in games.
とすると、「パフォーマンスに[ムラがあり](https://eikaiwa.dmm.com/uknow/questions/54531/)、監督は練習態度や試合での結果を重視している。」となります。
役に立ちそうな単語とフレーズ
inconsistent 一貫性のない
attitude in practice 練習態度
results in games 試合での結果
参考になれば幸いです。
日本 
