SHANGHAI — Michael Phelps registered a comfortable win in the 100-meter butterfly at the swimming world championships Saturday without Milorad Cavic or Ryan Lochte to challenge him.

SHANGHAI — Michael Phelps registered a comfortable win in the 100-meter butterfly at the swimming world championships Saturday without Milorad Cavic or Ryan Lochte to challenge him.

Phelps used his usual strategy for his third gold of the championship: Touching third at the turn and pulling ahead in the second lap to finish in 50.71 seconds. Konrad Czerniak of Poland took the silver in 51.15 while another American, Tyler McGill, earned bronze in 51.26.

Cavic, who is still regaining his form following back surgery, didn't advance from morning heats Friday. Lochte, who edged Phelps for gold in the 200 freestyle and 200 individual medley, wasn't entered.

Meanwhile, American teenager Missy Franklin continued to impress at her breakout meet, and Rebecca Adlington won the 800 free to give Britain its first gold in the pool and a big boost going into next year's London Olympics.

The 16-year-old Franklin won the first major individual gold of her career in the 200 backstroke, then came back an hour later and swam the anchor leg as the United States claimed gold in the 4x100 medley relay.

Franklin has three golds and five medals in all, having also set up the Americans' victory in the 4x200 free relay two days ago, when she swam faster than Federica Pellegrini did in winning the individual 200.

Rebecca Soni set up the relay win with a solid breaststroke leg, and she also has three golds. Natalie Coughlin and Dana Vollmer helped the Americans win this relay at worlds for the first time since 1998 in Perth, Australia.

Also, Cesar Cielo retained his title in the 50 free, adding to his gold in the 50 fly.