In golf, a hole in one or hole-in-one (also known as an ace, mostly in American English) is when a ball hit from a tee shot finishes in the cup. This awards the player a score of one for the hole. Holes in one most commonly occur on par 3 holes, the shortest distance holes on a standard size golf course. Longer hitters have also accomplished this feat on longer holes, though nearly all par 4 and par 5 holes are too long for golfers to reach in a single shot. While well known outside of golf and often requiring a well hit shot and significant power, holes in one are considered to also contain an element of luck. As such, they are more common and considered less impressive than other hole accomplishments such as completing a par 5 in two shots (an albatross). As of October 2008, a condor (four under par) hole-in-one on a par 5 hole had been recorded on four occasions, aided by thin air at high altitude, or by cutting the corner on a doglegged or horseshoe-shaped hole.
Holes-in-one ("aces") are also recorded in the sport of disc golf, in which a round plastic disc is thrown toward a metal basket-shaped target.