Hit and miss from the West Ham goalkeeper. Could have saved at least one of Boselli's efforts but positioned himself admirably in other instances. Conceded the penalty late on which Wigan scored from.
An unimpressive performance from Sam Allardyce's second-teamer. He - and many of his team-mate's tonight - will want to put this defeat and performance behind them.
One of the more notable performances in the West Ham back line, by virtue of quality tackles and occasional interceptions.
Looked unable to handle too many of the Wigan attacks and will need to work hard to succeed at the top level based on this performance.
A poor performance from the Hammers centre-back, who will be disappointed to have been part of a back four which conceded so many goals at home to Wigan.
The former Wolves winger continues to struggle to justify his hefty transfer fee, though his pace did cause one or two problems, albeit not often enough for a home cup performance.
Went off injured just before the penalty after an uninspired performance in front of home fans at Upton Park.
Active in the middle of the park all match, the Hammers midfielder excelled at creating chances and keeping the tempo up but suffered at finishing his efforts or crafting goalscoring chances. Brought off with just under 20 minutes on the clock remaining.
An anonymous display from the striker in the third round, as the Hammers fired blanks throughout. Barely noticeable in attack, his performance will not have helped his push for first-team football
A solid attacking performance from the striker, who scored the opening goal of the evening which gave the Hammers a brief lead at the start of the match.
Ali Al Habsi
Average between the sticks, but then again he was not called upon too often as West Ham were restricted to mainly wayward shots and frustrated attacking moves.
Scored a scorcher from outside the area to put Wigan ahead as half-time approached, which was crucial in giving the visitors momentum.
The full-back remains a contrasting figure - occasionally brilliant, occasionally appallingly clumsy - but his better side shone tonight as he bagged an assist for the first Wigan goal and helped keep the Hammers at bay at the other end of the pitch.
The defender was good in his passing, tackling and marking throughout. More of this away from home will help their doubtless relegation-fight in the league.
Another example of a player who deserves credit for keeping the Latics ahead in a second half that could have easily slipped through their fingertips.
Only a few tackles and average positional play downgraded Lopez's rating, who did not play too bad in east London on Tuesday night.
His key contribution was winning the penalty at the end of the match, but he was instrumental in seeing the Latics be able to stand their ground in the centre of the park throughout.
The sort of player who rarely gets praise but can often deserve it, the former Wolves holding midfielder made sure the Hammers struggleed to get the ball past the Wigan back four enough.
A threat on occasion at Upton Park, the on-loan midfielder showed why Arsenal value him so highly with bursts of energy and creativity.
Two goals from the Argentine ensured their progression into the fourth round of the League Cup. A typical, impressive poacher's performance.
Less eye-catching on Tuesday evening than some of his team-mates, the Wigan midfielder still put in a decent shift at Upton Park en route to their victory.