Kyle Coody (73RH), Danny Green (76SC), Brad Hardin (75RH) and Dave Yarnes (73RH) tied for fourth at 2-over-par 145.
Zahringer, the runner-up at the 2001 Mid-Amateur, posted the low round Saturday at Round Hill with a 68, but only managed a 74 at Stanwich, where he is member. He is ready for the 64-man match-play portion, where a medalist has never won the match-play segment.
'I think I can win and I have won before so that's not a new step or an additional evolution of my competitive golf game,' Zahringer said. 'It's really staying focused and composed. Sometimes in a match, it's making fewer mistakes than your opponent, sometime it's playing better than him. There's still a lot of golf left. Everybody stay tuned, including myself.'
Carter, who won eight consecutive West Virginia Amateurs and was a Mid-Amateur quarterfinalist in 1996 and 1997, followed his even-par 72 Saturday with a 70 at Round Hill. He is the only player in the field who has not posted a round over par in the first two rounds.
Sharp, who works at the same insurance firm as Carter, collected four bogeys and three birdies in his second round.
The U.S. Mid-Amateur Championship is open to all players 25 years or older with a USGA Handicap Index not exceeding 3.4. All players competed on the two courses in a stroke-play format before the top-64 golfers advance to match-play.