Nelson (2-2) picked up the win over the Padres on Sunday, allowing four runs on eight hits and a walk while striking out three over five innings.

The Diamondbacks activated Nelson (elbow) from the 15-day injured list ahead of his start against the Padres on Sunday.

Diamondbacks manager Torey Lovullo said Nelson (elbow) will "most likely" return from the 15-day injured list to start Sunday's game versus the Padres at Chase Field, Jesse Friedman of GoPHNX.com reports.

Diamondbacks manager Torey Lovullo said Monday that he expects Nelson (elbow) to be back "soon enough," and that the right-hander may not need a rehab assignment, Jesse Friedman of GoPHNX.com reports.

Nelson (elbow) will throw a bullpen session Wednesday, Theo Mackie of The Arizona Republic reports.

The Diamondbacks placed Nelson (elbow) on the 15-day injured list Friday.

Nelson will begin the season in the rotation, Steve Gilbert of MLB.com reports.

Nelson allowed one run on five hits and two walks while striking out nine over five innings in Friday's spring start against the Mariners.

Nelson allowed one run on four hits and three walks while striking out three over 3.2 innings in Saturday's spring start against the Rangers.

Nelson allowed one run on four hits and one walk while striking out two over 3.2 innings in Monday's spring start against the Athletics.