Not much from Amir Khan tonight to worry Kell Brook
The Bolton welterweight, in his second fight since returning to the ring after a two-year absence, was knocked to the floor in the final seconds of the second round.
Colombian-born Vargas, 29, had already been put down himself when he stunned Khan and the capacity crowd.
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Hide AdBut, with potential next opponent Kell Brook watching at ringside, Khan recovered on his stool, came out and floored Vargas again.
The 31-year-old was unable to finish the job there and then, though, and eventually had to settle for a unanimous points victory from what was at times a gruelling battle.
But it was not a performance which will give the likes Brook or Manny Pacquiao too many sleepless nights.
Brook said later he would not have let Khan off the hook, as Vargas had.