The Nets converted Martin to a two-way contract Saturday, Adam Zagoria of ZagsBlog.com reports.
The Nets signed Martin to a training camp deal Friday, Ben DuBose of USA Today reports.
The Hawks requested waivers on Martin on Friday.
Martin recorded 25 points (9-15 FG, 2-5 3Pt, 5-7 FT), nine rebounds and three assists in 23 minutes during Wednesday's 99-93 Summer League win over the Timberwolves.
Atlanta recalled Martin from the G League's College Park Skyhawks on Monday, Brad Rowland of the Locked On Podcast Network reports.
Martin recorded 23 points (10-16 FG, 2-4 3Pt, 1-1 FT), 10 rebounds and one block in 36 minutes during Monday's 111-104 loss to Capital City.
Martin (lower body) recorded 12 points (4-13 FG, 0-2 3Pt, 2-2 FT), nine rebounds and one assist in 32 minutes during Saturday's 108-97 win over Capital City.
Martin didn't play in Sunday's 114-107 loss to Austin due to a lower-body injury.
Martin notched 20 points (8-18 FG, 1-4 3Pt, 2-2 FT), 11 rebounds, one steal and one assist in 33 minutes during Wednesday's 126-121 loss to the Herd.
Martin posted 22 points (8-16 FG, 2-5 3Pt, 2-2 FT), five rebounds and one steal in 34 minutes during Monday's 131-116 loss to Lakeland.