Guilherme Rosolen is a sprint butterfly specialist from Brazil and has been a frequent on the national podium in recent years. Rosolen trains at the Esporte Clube Pinheiros in Sao Paulo.
In 2014, he earned a gold medal in the 4×100 meter medley relay at the Maria Lenk Trophy and the Jose Finkel Trophy.
At the 2015 Brazil Open Championships, Rosolen recorded a personal best time of 23.61 en route to a silver medal in the 50 meter butterfly. Earlier in the year, he won a bronze medal in the same event at the Brazilian Championships. He also reclaimed the gold medal in the 4×100 meter medley relay at the Jose Finkel Trophy and a silver in the event at the Maria Lenk Trophy.
In 2016, Rosolen had his best results at national competitions. At the Brazilian Championships, he secured a silver in the 100 meter butterfly and at his country’s Open Championships he won a silver medal in the 50 meter butterfly and a bronze in the 100 meter butterfly.