Renato "Ato" Guilas Agustin is a Filipino former professional basketball player, politician, and current assistant coach for the San Miguel Beermen. He played college basketball for the Lyceum of the Philippines before moving on to play professional basketball in the Philippine Basketball Association (PBA).

The San Miguel Beermen are a professional basketball team in the Philippine Basketball Association (PBA). It is one of three PBA clubs owned by the San Miguel Corporation group of companies along with the Magnolia Hotshots and Barangay Ginebra San Miguel. It is the most successful franchise in the history of the PBA and the only remaining original franchise in the league. The Beermen have the most titles with 29 and the most all-time victories with more than 1,200 wins. In addition, it has won the Grand Slam in 1989 and the Perpetual Jun Bernardino Trophy after winning three straight PBA Philippine Cups from 2015 to 2017. It is also the only team to have won at least one PBA title in each of the six numerical decades of the league's existence and was the first professional basketball team ever to come back from a 0–3 deficit to win a best-of-seven playoff series which they did during the 2015–16 Philippine Cup Finals.