Though this U.S. Open has not yet shown us its peak trademark brutality, several intriguing storylines emerged heading into the weekend. Ten players are under par at Shinnecock Hills in Southampton, N.Y. — more than on Friday evening in 2018 (one) but fewer than in 2004 (11). A past champion has built a sturdy lead, but a bevy of accomplished players aren’t too far in the rearview mirror. These are the top numbers and notes to know from Day 2 of the 126th U.S. Open at Shinnecock Hills. 1.