Amir Khan returned to winning ways by outclassing and bloodying Carlos Molina into a 10th-round retirement in Los Angeles.Khan lost his last two fights against Lamont Peterson and Danny Garcia, but in his first bout under the guidance of new trainer Virgil Hunter the 26-year-old showed the polish and determination of his rise to world title glory years beforehand.Opening up Molina in the first round, Khan won all 10 stanzas with lightning flurries and merciless pressure on the cut until referee Jack Reiss and Molina’s corner agreed not to begin an 11th round due to the damage sustained by the 27-year-old American.It was Molina’s first defeat in 19 professional bouts, while Khan moves his record up to 27-3. The Bolton boxer may well target retribution against Peterson and/or Garcia next as he strives to continue his quest for re-establishment as a world class light welterweight.Though much emphasis was placed on Khan’s possible switch to a more cerebral, defence-orientated strategy under Hunter in the build-up to the main event at the LA Memorial Sports Arena, the Englishman showed occasional glimmers of old habits in the first three rounds as he walked into clean lands while opening up the fight.Nonetheless, for every singular shot Molina was able to get in, he took three or four himself as ‘King’ Khan started hot with his trademark bursts of speed and aggression.By the end of the first, a small cut had been opened above the eye of the American and with the loud words of a bellowing Hunter ringing in his ear, Khan gradually reverted to a more patient approach as he opened up a comfortable lead in the bout.Stunning Molina with a rugged left in the fifth, it became apparent that the home hope was tough enough to soak up the abuse for 12 rounds and suffer a more dignified decision loss if he could not shock Khan with a sudden finish.But neither scenario would come to fruition as Khan’s more measured approach to the middle stanzas served to further bloody Molina. At the end of rounds eight and nine, both Reiss and the appointed fight doctor took long hard looks at the cut whilst warning the corner that a forced retirement beckoned.And after another one-sided round put Khan 100-90 up on the unofficial Yahoo!-Eurosport scorecard, it did not take the official or Molina’s team long to agree not to let him come back out for an 11th.Agencies