Grant Betulius, Mike Nelson, and Emily Hovren of the Hawkeye swimming and diving program will compete at the 2013 Phillips 66 National Championships Tuesday through Saturday. The event, which will also serve as the World Championship Trials for the U.S. swim team, is being held at the Indiana University Natatorium on the campus of Indiana University/Purdue University-Indianapolis.

The three Hawkeyes will compete in five events. Betulius will swim in the 50 and 100 backstroke, Nelson will compete in the 50 and 100 breaststroke, and Hovren will swim the 200 individual medley relay.

In order to qualify for the U.S. swimming team, swimmers must finish either first or second in their respective Olympic events — this does not apply to the 100 and 200 freestyles. The top four finishers in those events, as well as the champion in each of the non-Olympic events, will make the Team USA roster that will compete in the 15th FINA World Championships in Barcelona, Spain, on July 19 through Aug. 4.

Both Nelson and Betulius are scheduled to compete on Thursday and Friday. Their shorter races will take place on Thursday, and the longer races will occur Friday.

Hovren will wait to compete until Saturday.

The championships will be streamed live at www.usaswimming.org.