A week after announcing closer Justin Martinez will undergo Tommy John surgery, the Arizona Diamondbacks announced Friday that A.J. Puk will undergo the same procedure. The club opened the season with visions of Martinez, a right-hander, and the lefty Puk potentially sharing closer duties. Now, Puk — who has actually been out since April 18 — is the fourth member of the Diamondbacks’ staff set for major elbow surgery, joining starters Corbin Burnes and Jordan Montgomery.