Obertan (right) was United's best performer on the night
By Phil McNulty
Chief football writer, at Old Trafford
Rodrigo Tello's deflected first-half goal defeated a youthful Manchester United as Besiktas ended their 23-game unbeaten sequence at Old Trafford in the Champions League.
Sir Alex Ferguson - with qualification for the last 16 already assured - fielded an experimental line-up and gave some of Manchester United's young brigade a chance to shine on the big European stage.
Gabriel Obertan was the most promising of the Old Trafford undercard, but the inexperience of a side also containing Danny Welbeck, Federico Macheda, Rafael da Silva and Darron Gibson was exposed as they failed to turn long periods of territorial domination into an end product.
And that long run without a loss, stretching back to when AC Milan won 1-0 at Old Trafford in February 2005, was broken when Tello's long-range strike after 20 minutes took a touch off Rafael and beat keeper Ben Foster.
Besiktas's veteran keeper Rustu emerged as his side's hero in injury-time, rolling back the years to produce two fabulous saves in quick succession from Macheda and Wes Brown as United went in desperate search of an equaliser.
They were United's last opportunities and the noisy band of Besiktas supporters inside Old Trafford celebrated wildly at the final whistle.
United boss Ferguson made eight changes from the side that won easily against Everton on Saturday, and while they were lively they created little to trouble the colourful Turkish international keeper Rustu.
Obertan made a lively start and flashed an inviting cross into the six-yard box with no United player able to apply the final touch - and Macheda sent a shot just wide on the turn from the edge of the area.
Besiktas, perhaps encouraged by the under-strength nature of United's team, swept forward and took the lead after 20 minutes when Tello sent an angled shot from 25 yards beyond the reach of Foster.
It looked like Foster may have been at fault, but in the much-criticised keeper's defence, Tello's effort took a crucial deflection off Rafael.
Obertan had a chance to draw United level when he broke clear into the area, but his attempt to beat Rustu at his near post failed as the keeper made a comfortable block.
Michael Fink could have doubled Besiktas's lead as the interval approached, but he sent a low effort against the outside of an upright from 10 yards with Foster helpless.
United continued to enjoy almost all the possession after the break, with Ji-Sung Park shooting wide and the lively Obertan forcing Rustu to dive low to his left to save his 20-yard effort after a superb run.
Rodrigo Tello celebrates scoring the winner for Besiktas
Ferguson attempted to give United an end product for all their possession by introducing Michael Owen for Park after 68 minutes as Besiktas were having difficulty getting out of their own half.
And the Scot was left fuming on the sidelines as another substitute, Patrice Evra, provided a penalty shout when he looked like he was blocked in the box, but the referee waved away the appeals.
There was still time for United to finally find their way through to Rustu in five minutes of stoppage time, but the battle-hardened keeper showed he still possessed some of the old magic with two stunning stops to deny first Macheda and then Brown to seal a famous victory for the Turks.
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