For the Saturday morning foursomes matches, the par 3 third hole at Merion played at 219 yards.
In the afternoon singles matches, the tee for the the par 3 third hole was moved back to the same tee area used for the par 4 sixth hole. They actually had two sets of tees side by side on the same tee box - one for the 3rd hole and one for the 6th hole...there were hole numbers spray painted on the ground to distinquish between the two sets of tees....they were literally side by side.
The yardage for the hole in the afternoon changed from 219 yards to 274 yards (252 front edge, 274 hole). It was very funny watching the players/caddies expressions as they exited the 2nd green and walked to the normal tee box for the 3rd hole - to a man, they all walked towards the usual tee box only to find no tee markers. They then looked back to the left and saw the tee markers on the 6th hole tee box. They were all laughing and shaking their heads as they walked back another 50 yards. I was standing right next to the tee, and the players and caddies were scrambling to calculate yardages from the new tee...I don't think they saw that one coming.
I watched 5 groups (10 players) tee off, and 7 players hit 3 wood, and 3 players hit DRIVER. 6 of 10 hit the green. No birdies.
I suppose the USGA is testing out the idea of playing the 3rd from this distance, although I can't imagine how they would handle the logistics of having two sets of tees on the same teeing area.