 His 720 total assists broke the Nuggets' single-season assists record of 714 held by Nick Van Exel.On July 20, 2015, the Nuggets traded Lawson and a 2017 second round draft pick to the Houston Rockets in exchange for Joey Dorsey, Nick Johnson, Kostas Papanikolaou, Pablo Prigioni, a 2016 first round draft pick, and cash considerations.He made his debut for the Rockets in the team's season opener against his former team the Denver Nuggets on October 28, recording 12 points and 6 assists as a starter in a 105–85 loss.