 After a short stint in the minors in 2000 , Nathan spent most of the season in the majors , finishing 5 – 2 and even hitting two home runs . But he struggled with his control , walking 63 in <unk> ⁄ 3 innings and ending the season with a 5 @.@ 21 ERA . He was on the disabled list twice : from May 17 to June 6 for right shoulder tendinitis and from July 14 to August 18 for an <unk> right shoulder , <unk> <unk> surgery on the afflicted shoulder at the end of the season . Nathan divided 2001 between the AAA Fresno <unk> and AA Shreveport both starting and relieving , finishing with a disappointing combined 3 – 11 record and an ERA over 7 . Nathan improved slightly in 2002 to 6 – 12 with an ERA of over 5 at Fresno , but finally <unk> his <unk> struggles to return to the Giants in September with 32 ⁄ 3 scoreless innings in relief . 
