The away team barely troubled all night but Benitez's men were unable to capitalize on their possession as, without Eden Hazard and Juan Mata, they struggled to create against a stout QPR defense all game long.
The relegation strugglers managed to make Chelsea pay for its profligacy as, after a corner broke to Wright-Phillips on the edge of the area, the winger made no mistake and fired an effort into the bottom corner.
Rafa Benitez's penchant for squad rotation continued as the manager made five changes from the team that beat Everton 2-1. Marko Marin replaced Ramires to make his first Premier League start of the season, while Ross Turnbull, Ryan Bertrand, Victor Moses and Oscar all also started in place of Petr Cech, Ashley Cole, Eden Hazard and Juan Mata.
Meanwhile, the visitors also made four changes from the side that succumbed to a disappointing 3-0 defeat at home to Liverpool, as Fabio, Shaun Derry, Esteban Granero and Junior Hoilett replaced Armand Traore, Djibril Cisse, Samba Diakite and Wright-Phillips.
Just three minutes in, Chelsea could count itself lucky to still have 11 players on the pitch after Marin, clearly eager to impress after being awarded a rare start, put in a dangerous challenge on Stephane Mbia. But fortunately for the German, Lee Mason deemed it worthy of just a booking.
The intensity of that opening incident was, however, not often replicated in the remainder of the first half as, with the away side sitting deep and Chelsea without Mata and Hazard, chances were few and far between for either side.
The only real chance of the first half came just two minutes before the break as an Oscar shot deflected on its way by Lampard required a smart save from Julio Cesar to keep the first half goalless.
After that fairly tepid start to the game, the opening of the second half brought a welcome increase in tempo as Chelsea began to create clear-cut chances. First, Moses was unable to meet a delightful Marin cross and then minutes later an Ivanovic header from a Marin corner clipped the bar on its way over.
The early second-half onslaught reached its peak with an excellent chance for Fernando Torres. A deflected David Luiz effort fell to the striker ten yards out but the Spaniard could only fire straight at Cesar.
The home side's pressure almost told after 65 minutes as the ball fell to Lampard, who after duly firing into the bottom corner was deemed just offside by the linesman.
As Chelsea was unable to capitalize on its pressure, the second half wore on and, with 10 minutes remaining a rare corner led to a shock opener for the away side. After the corner was cleared at the near post, Taarabt deftly laid the ball into Wright-Phillips' path and the former Chelsea player found the corner of the goal from 25 yards out.
Chelsea's response was frenetic but chances remained hard to come by, the best chance falling to Ivanovic as he headed a Mata cross just over the bar.
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