John Isner has defeated Christian Harrison in three sets to book his place in the third round of the Atlanta Open.
The first set went the way of the big-serving Isner, who prevailed 11-9 in a tie-break. However, Harrison was able to break serve in the second set to take it 6-4.
Once again, the match went with serve until Isner secured a decisive break to go 6-5 ahead before serving out for the win.
The 28-year-old will now face James Blake, who beat Evgeny Donskoy 6-3 6-2, in the next round.
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