Sam Querrey up 4-3 in fourth set
Sam Querrey continues to battle and has a 4-3 lead in the fourth set against Stanislas Wawrinka.
Wawrinka leads the fourth-round match, 7-6, 6-7, 7-5.
Both players are vying for their first appearances in a Grand Slam quarterfinal.
UPDATE (4:40): Querrey is now up 5-3. Wawrinka is serving to stay alive in the set.
UPDATE (4:52): Querrey can't close it. Wawrinka pulls to within 5-4 in the fourth set.
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