But his final season with the Wildcats was cut short by injury and he needed surgery to replace the medial ligament in his elbow, a common procedure among baseball pitchers.
He battled through rehab and still remembers the day he strode out to the mound against the Red Sox at Fenway Park, pitching two scoreless innings in relief.
"That's my most satisfying moment in the major leagues. I went three-up, three-down in five pitches for the first innings, but walked the bases loaded in the second and somehow got out of it. It was very exciting."
The following year, he was traded to the Astros, where he pitched 74 innings in 71 games last season, producing an 8-4 winning record and a team-leading 20 saves on the worst outfit in the MLB (56-106). Returning to Fenway full time represents salvation to the right-hander.
"I'm very excited to join the Red Sox," says Melancon.
"It'll be fun to face the Yanks. I have a great appreciation for the Yankees' organisation. They made me a better baseball player and person, and I'm very thankful for that."
The presence of Melancon and Hundley in Auckland couldn't be timelier.
Toronto Blue Jays utility Chris Woodward has already been here a week, working with the Junior Diamond Blacks as they prepare for the Oceania event in Guam. Despite their relative inexperience at this level, hopes are high the young Kiwis can qualify for the under-18 world championships later this year.
Melancon's message to them will be the same one he passes on to the national administration as it strives to create a foothold in a cluttered New Zealand sporting landscape: "Many people helped me get to the MLB, but the ones that helped me most taught me work ethic. I'll convey that to NZ baseball - I know it has a lot of potential."