He was a member of the Estonian national team from 2000 to 2013. Meresaar started his career in hometown club ESS Falck Pärnu. During his career, Meresaar has also played in Estonian teams Pere Leib Tartu and Selver Tallinn. He has spent one season in Russia playing for Neftyanik Yaroslavl. He represented Estonia at the 2009 and 2011 European Volleyball Championships. To date he is one of the most experienced players for the national team with 175 games to his name. Meresaar has been voted Estonian Volleyball Player of the Year five times (2000–2003 and 2009).