 Complete the following phrase:  In April 2013, at the Maria Lenk Trophy in Brazil, Chierighini swam the seventh best time of the year in the 50-metre freestyle 21.88 seconds and fourth best in the 100-metre freestyle 48.11 seconds. At the 2013 World Aquatics Championships in Barcelona, he finished 7th in the 4×100-metre freestyle, along with Ferdo Santos, Nicolas Oliveira and Vinícius Waked. In the 100-metre freestyle, he equalled his personal best in the semifinal, with a time of 48.11 seconds, ranking third for the final, behind Adrian 47.95 and Feigen 48.07. He finished 6th in the final, with a time of 48.28. In the 50-meter freestyle, Cherighini reached the semifinals, where he beat his personal record with a time of 21.84 seconds. However, due to the high level of competition thirteen swimmers swam times below 22.0 second, better than 