Denisa Allertova served former No. 1 Ana Ivanovic the upset and ESPN's Pam Shirver and Prim Siripipat explain what it took to get it done.
How Allertova earned the espnW Star of the Day
Venus wins first-round matchup
Venus grateful for 18-0 record in US Open first round
The line between indomitable and in doubt
Doesn't take long for first Kyrgios tantrum
Wawrinka's hot drop shot
Things are looking up for del Po
Donaldson credits crowd energy with win
Is the US Open the most difficult major?
Djokovic credits 'unpredictable' Janowicz
Edmund: Best win of my career
Djokovic wins opening round despite troublesome arm
NYC mayor's US Open ceremony whoops
Keys prevails for first-round victory at US Open
How Shelby Rogers earned the espnW Star of the Day
Isner down two sets at US Open, still pulls off victory
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