Gretchen Walsh was back in the pool on Saturday after a few days off from competition in Paris.
The former Greenwich resident swam in the preliminary heats of the women's 50m freestyle on Saturday morning.
Her time of 24.37 was the fourth best time in the prelims, and she advanced to the semifinal Saturday afternoon.
In the semifinal, she swam a 24.17, the second best time in either of the two semifinals. She was bested by the world record holder, Sarah Sjoestroem, of Sweden, who set a new Olympic record with a 23.66.
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The 50m freestyle event is a sprint of one length of the pool and is decided by tenths of a second.
Walsh will swim in the 50m freestyle final Sunday at 12:30 p.m. ET.
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She has already won silver medals in the 100m butterfly and the 4x100 freestyle relay.
