Spieth in contention after rain alters course at Nelson (The Associated Press)

IRVING, Texas (AP) -- Jordan Spieth wasn't sure what par was at his hometown AT&T Byron Nelson and thinks it actually might have helped him through some frustrating early holes.

There's a reason the Masters champion was uncertain - overnight rain turned one of the signature par 4s at the saturated TPC Four Seasons into a pitch-and-putt par 3 at 105 yards for the second round Friday.

Spieth and every other early finisher within three shots of clubhouse leader Jon Curran turned in a birdie 2, and Gary Woodland had a hole-in-one when it was still possible that the easy wedge over a pond would play as a par 4. Tour officials later made the switch.

''I was able to fire at more pins, not really…