Steve "Stevie" Johnson Jr. (born December 24, 1989) is an American professional tennis player. For a brief period in August 2016 he was the top ranked American in men's singles. He has won four ATP Challenger Tour titles and one ATP Tour level title at Nottingham on grass. He won a bronze medal in men's doubles at the 2016 Olympics with Jack Sock.

Johnson played college tennis for the USC Trojans. He won the NCAA Men's Singles Championship in his junior and senior seasons (2011–2012), and he was a part of a Trojan team that won four consecutive NCAA Championships. These accomplishments during his college career cement him as the most-decorated college tennis player ever.

His father, Steve, is a tennis coach at the Rancho San Clemente Tennis and Fitness Club, and his mother, Michelle, is a math professor. His older sister, Alison, is also a graduate of the University of Southern California in Los Angeles. Johnson's girlfriend is Kendall Bateman, a former Trojan volleyball player who holds the school record for career assists. Johnson has credited his father with his success in tennis: "He taught me pretty much everything I know. Since I can remember, it's always been me and him out there hitting balls, having a blast. It's really been amazing. I wouldn't change anything." Growing up, he idolised Pete Sampras and Andre Agassi. At USC, Johnson majored in human performance, but left when he was three classes short of attaining his degree. Johnson hopes to complete his degree after his tennis career.

In July 2012, Johnson signed a clothing deal with Asics America and he is represented by Sam Duvall at Lagardere Unlimited. He currently trains at the USTA Player Development Center West in Carson, California. Johnson is currently working with the USTA and travels with a few other young Americans, while his personal coach is Craig Boynton, who is a USTA national coach for men's tennis. The team of Dustin Taylor and Rodney Marshall also help Steve hone his skills at the development center.

In his early career Steve's dad served as his coach. Stevie won four consecutive 18-under national team titles, becoming the first player in tournament history to be a member of four championship teams. Johnson contributed to a 6–1 victory over Texas in the 2005 final, a 6–1 triumph over Southern in 2006 and clinched Southern California's 4–3 win the next year over Southern. Some of Steve's junior accomplishments include being the 2008 Kalamazoo Doubles finalist and winning the 2008 Southern California Sectional Boys 18 championship in straight sets over J.T Sundling. This marked his fourth Sectionals title and near a clean sweep of all age divisions having won the 12s, 14s and 16s. He also has the distinction of being the only player to win the Triple Crown, singles and two doubles—twice. He also won nine Gold Balls. He was ranked the third-rated California senior tennis recruit (7th overall) in the country, according to TennisRecruiting.net. Lastly, he clinched the title for Southern California at the 2007 Junior Davis Cup.

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