Sentence:  She held her nerve after failing to <WSD>serve out</WSD> the match at the first attempt, seeing three match points slip by in a nervous service game at 6-4 5-4 and recovering from losing the tie-break to dominate the decider. 
Meaning of the word marked with <WSD> tags:  To win a set, or by extension a match, by holding serve (winning a game as the server).