On July 27, 2013, Green was traded to the Phoenix Suns alongside Miles Plumlee and a future first-round pick for Luis Scola.
Green started for the Suns when fellow guards Goran Dragić and Eric Bledsoe were injured during their respective periods in November 2013.
He received more starting time with the Suns after Bledsoe had a major knee injury during January, February, and early March 2014.
Throughout this period, Green would take over some games as being the team's leading scorer, including a 112–107 overtime victory against the Denver Nuggets, in which he'd record a then-career-high 36 points against them, which included making 8 of the team's 13 points in overtime.

On March 6, 2014, Green recorded a new career-high 41 points, including a career-high 8 made three-pointers, in a 128–122 victory over the Oklahoma City Thunder.
When Eric Bledsoe returned to action on March 12, 2014, Green returned to his bench role.
Green finished the season with new career highs in points per game and free-throw percentage.
As a result, he finished fourth in the NBA Most Improved Player Award behind Anthony Davis, Lance Stephenson, and Green's teammate Goran Dragić.

On April 8, 2015, Green scored a season-high 30 points on 10-of-19 shooting in a 104–107 loss to the Dallas Mavericks.
On July 27, 2013, Green was traded to the Phoenix Suns alongside Miles Plumlee and a future first-round pick for Luis Scola. Green started for the Suns when fellow guards Goran Dragić and Eric Bledsoe were injured during their respective periods in November 2013. He received more starting time with the Suns after Bledsoe had a major knee injury during January, February, and early March 2014. Throughout this period, Green would take over some games as being the team's leading scorer, including a 112–107 overtime victory against the Denver Nuggets, in which he'd record a then-career-high 36 points against them, which included making 8 of the team's 13 points in overtime.
On March 6, 2014, Green recorded a new career-high 41 points, including a career-high 8 made three-pointers, in a 128–122 victory over the Oklahoma City Thunder. When Eric Bledsoe returned to action on March 12, 2014, Green returned to his bench role. Green finished the season with new career highs in points per game and free-throw percentage. As a result, he finished fourth in the NBA Most Improved Player Award behind Anthony Davis, Lance Stephenson, and Green's teammate Goran Dragić.
On April 8, 2015, Green scored a season-high 30 points on 10-of-19 shooting in a 104–107 loss to the Dallas Mavericks.
Gerald Green