1986, the Boston Celtics offered him a two-year deal worth $315,000, which the Jazz matched. Almost immediately after matching the offer, the Jazz traded him to Boston for a future draft pick. He played two seasons for the Celtics, appearing in the 1987 NBA Finals, before being chosen by the Miami Heat in the 1988 NBA expansion draft. However, Roberts was traded to the Milwaukee Bucks before ever playing a game for the Heat. He played for the Bucks for five seasons, where he had his best years as a professional, reaching the 10 points per game mark and playing more minutes than he ever had in his career. The highlight of his time in Milwaukee came in Game 4 of the Eastern Conference semi-finals in 1989, in which Roberts replaced injured forward Terry Cummings and scored a career-high 33 points in a 96-94 loss to the Detroit Pistons. The performance was especially impressive considering it came against Dennis Rodman, one of the best defenders in the league. The tough, defense-minded Pistons would eventually win the NBA championship later that season. Roberts was released by the Bucks when his contract expired after the 1992-93 NBA season. After not renewing with the Bucks in 1993, he signed with FC Barcelona of the Spanish Liga ACB, where in his only season he managed to win the Spanish Cup, defeating Taugrés Baskonia in the final. For the season he averaged 14.8 points and 5.8 rebounds per game. After his second stint in Europe, he played for the Chicago Rockers of the Continental Basketball Association. He then signed a 10-day contract with the Cleveland Cavaliers, and was immediately put to work due to starting power forward Tyrone Hill going down with an ankle injury. Once Hill returned though, Roberts stopped seeing playing time, but considered his stint with the Cavs as a stepping stone. He then signed with the Los Angeles Lakers for the 1995-96 season, playing only 33 games. Coinciding with Magic Johnson's "comeback" year, Roberts became the only player in NBA history to be a teammate of both Johnson and Larry Bird. The following year, he signed a one-year contract with the Dallas Mavericks, but was released almost immediately after Don Nelson became General Manager. NBA Career Statistics Regular Season |- | align="left" | 1983–84 | align="left" | San Antonio | 79 || 8 || 19.4 || .536 || .250 || .837