Titleist (pronounced /ˈtaɪtəlɪst/ "title-ist") is an American brand of golf equipment produced by the Acushnet Company, headquartered in Fairhaven, Massachusetts, United States.

After this initial discovery, Young took X-rays of more golf balls and found that most were poorly constructed with off-center cores and prone to erratic shots.

The combination of a larger firmer core, a thinner cover, and 60 fewer dimples resulted in a ball that retained the same soft feel of the Pro V1 while reducing spin and increasing distance.

[17] The following November, Callaway won an injunction in a Delaware court, ruling that sales of the Pro V1 golf balls must be stopped from January 1, 2009, with professionals being able to continue with their use until the end of the year.

[19] Titleist has maintained endorsement deals with many leading professional players, including Ludvig Åberg, Cameron Smith, Jordan Spieth, Justin Thomas, and Will Zalatoris.

Players previously contracted with Titleist include Tiger Woods and Rory McIlroy, before both moved to Nike and then later TaylorMade,[20][21] and Phil Mickelson, who switched to Callaway shortly after his 2004 Masters Tournament win.