When Henry Do and his coach Dave Kendall discussed just how low of a score the Greenhills sophomore could shoot the second round the Boyne Tournament of Champions on Tuesday, neither realized what kind of magic the day would produce.

The 15-year-old not only tied the tournament record with a 10-under par 62, but captured a 2-shot lead that he'll take into Wednesday's final round of the event that pairs men, women, juniors and seniors together in the same competitive field.

Do's round ties Michael Harris' previous tournament record which was set in 2007.

"When I got to six or seven under, I knew this was probably a round I would never forget," Do said Tuesday night. "I just wanted to keep it going as best as I could."

Do made the turn at 2 under a day after making his Tournament of Champions debut with an even-par 72. But even after a solid front nine, Do quickly discovered that his career day was just beginning.

Do tallied an 8-under 28 over his final nine holes, posting six birdies and an eagle - all part of a day he began just hoping to score under par. It turned out to be much more than that.

"Usually you get to four or five under and you start worrying about what you're going to shoot and you start protecting," Kendall said. "It's very unusual that a player will let themselves go shoot low when they've really got their game."

Do's mastery of the course Tuesday never even fazed him.

Do eagled the Alpine Course's Par 5, 505-yard 5th hole (his 14th of the day), which only boosted his confidence for the rest of the way.

But that's when his mind shifted back to the talk with Kendall, who warned him not to put too much stock in how far under par he was, but instead, to continue to rely on his steady style of play. No matter what.

"I knew I really had something going, but I didn't want to play too aggressive where it could cost me my round," Do said. "I knew this was something cool, something special."

So the 5-foot-4, 128-pound Do - who composes music in his spare time - kept his head, finishing his remarkable round at 10-under. He holds a 2-shot lead over LPGA Tour Player Allison Fouch and a 3-shot lead over former Michigan golf captain Andy Matthews.

Matthews, who shot a 65 to take the lead after Monday's first round, carded a 72 on Tuesday.

Afterwards, Do took the round in stride, knowing he still has another 18 holes separating him from a tournament title. For Kendall, who shot 73 Tuesday to post the best senior 2-round score (141) admires his pupil's calm demeanor, something he knows will serve Do well in Wednesday's final round.

"He's not intimidated," Kendall said. "Just the fact that he came up to a tournament like this and shot 72 in the first round shows he just plays the way he plays. He just does what he does. All he knows is to do his best."

Jeff Arnold covers sports for AnnArbor.com and can be reached at (734) 623-2554 or by email at jeffarnold@annarbor.com. Follow him on Twitter @jeffreyparnold.