Max Herendeen (Illinois Athletics Photo)

The four leaders all sit one shot ahead of nine golfers at 4-under in the crowded leaderboard. Through the first two rounds, 37 golfers are under par and within four shots of the lead. 

Basically, through the first two rounds, this is anyone's tournament still. Jones is the highest-ranked player of the four, as he is No. 32 in the Golfweek/AmateurGolf.com U.S. Rankings.

The round of the day belonged to Matthew Manganello, who followed up a first-round 4-over 74 with a second-round 7-under 63 to jump up to T14 and 3-under on the leaderboard.

First-round leader Ben Warian shot a second-round 1-over 71 after a first-round 5-under 65 to sit with the gaggle of players at 4-under and T5.

The Sunnehanna Amateur was inaugurated in July 1954. It was the first country club-sponsored 72-hole stroke play competition for amateurs in the United States. The tournament is played on a classic A.W. Tillinghast design.

Only one other amateur tournament in the United States can boast contestants such as Chick Evans, Arnold Palmer, Julius Boros, Art Wall, Jack Nicklaus, Phil Mickelson, Tiger Woods, and Rickie Fowler: the United States Amateur. Its medal-play format has been emulated by countless amateur tournaments across the country.