当他直落几盘获胜时，比赛很快就结束了。

The match ended quickly when he won in straight ___sets.

他们输掉了第一盘，但奋起直追赢下了第二盘。

They lost the first set but fought back to win the second ___set.

赢得前两盘给了她巨大的信心提振。

Winning the first two ___sets gave her a huge confidence boost.