AMattheis Motorsport, currently competing as Mercado Livre Racing due to sponsorship reasons, is a Brazilian auto racing team based in Petropolis, Rio de Janeiro, that currently competes in Stock Car Brasil and Império Endurance Brasil. The team was sponsored by Red Bull from 2009 to 2016 and was sponsored by Brazilian fuel company Ipiranga in Stock Car. From 2026 onwards, the team is sponsored by Mercado Livre. A.Mattheis is among the most successful Stock Car Brasil teams, winning championships in 2005, 2008, 2009, 2011, 2012.
The team was formed in 1994 by team principal and then racing driver Andreas Mattheis. The team won the 2005 Stock Car championship with Giuliano Losacco. Since 2007 the team expanded his operations to four cars and created a subsidiary called WA Mattheis. In 2009 the team signed a sponsorship deal with Red Bull, that lasted until 2016. During this period, the team won the 2009, 2011, and 2012 season with Cacá Bueno.