Bethesda’s Katie Ledecky cruised to victory in a pair of races Thursday night at the TYR Pro Swim Series, the year’s first major swim meet, in Knoxville, Tenn.

In the 200-meter freestyle, the night’s first event at Allan Jones Intercollegiate Aquatic Center, the five-time Olympic gold medalist finished far ahead of the field in 1:55.78. Later in the evening, she won the 400-meter individual medley in 4:39.39.

In the 200 free, Simone Manuel, a former Stanford teammate of Ledecky’s who won two golds and two silvers at the 2016 Olympics in Rio de Janeiro, held off Melanie Margalis by just over a tenth of a second for second place, 1:58.52 to 1:58.68.

In the 400 IM, Hali Flickinger finished second in 4:39.80. She had led Ledecky halfway through the race before the Stone Ridge School graduate overtook her with a freestyle leg of 1:00.09.

Margalis finished third in 4:40.31.

In other races, Andrew Wilson won the men’s 100-meter breaststroke in 1:00.57, and Michael Andrew prevailed in the men’s 50-meter backstroke in 24.73.

Annie Lazor, who swam her best time ever in the women’s 100-meter breaststroke in the morning prelims with a time of 1:07.28, did even better in the final. She won with a time of 1:06.89.

Olivia Smoligia won the women’s 50-meter backstroke (27.85), and Kelsi Dahlia took the women’s 100-meter butterfly (57.86).