By Ryan Burton
Timothy Bradley battered Brandon Rios en route to a ninth-round technical knockout on Saturday in a lopsided welterweight bout that had a dejected Rios announcing his retirement.
Bradley retained his World Boxing Organization world title, improving to 33-1-1 with 13 wins inside the distance with the triumph at the Thomas & Mack Center in Las Vegas.
Fighting for the first time under the guidance of trainer Teddy Atlas, Bradley was quick and aggressive against a challenger who struggled to make the 147-pound weight limit.
Bradley, 32, was fast off the mark, landing a series of combinations in a big first round.
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