10th hole hit driver on the short Par 4 315 yards. noticed when it landed it was right inline with the flag. joked around as we walked off the tee that it was in the hole. we could not see the hole from where we tee'd off as it was uphill. once at the green there was no ball on the green. I checked to see if it maybe ran through the green and could not see anything. I asked my partner to look in the hole. as he looked in the hole he smiled, I told him that is not a funny joke, he replied its in there!!!!!!!!. This was my first hole in one and to have it happen on a PAR 4 was insane.