Watts and Cook sit at 3-under total. Both shot low rounds of the tournament in their second round, with Cook shooting a 5-under 66 after a first-round 2-over 73 and Watts shooting a second-round 4-under 67 after an opening round of 1-over 72.
First-round leader Trent Alexander shot an even-par 71 after a first-round 2-under 69 and is one shot back in solo second place.
Nick Maccario is in solo fourth place at 1-under after rounds of 71-70.
Cook finished runner-up at the 2011 U.S. Mid-Amateur and won the 2019 Indiana Mid-Amateur.
