Saber is a main protagonist featured in Type-Moon's visual novel Fate/stay night, and the face of the Fate franchise as a whole. In the visual novel, she is Shirou Emiya's Servant, and is the main heroine and love interest of Fate, the visual novel's first route.
Saber is known for having the most appearances of all major tournaments, and is one of the longest-running competitors of all time, continously fighting in any tournament she's eligible in since 2006. Hence, she has a very long history of battles, much like the legendary king she represents.
When it comes to winning best girl battles however, Saber leaves much to be desired. Despite consistently being one of the stronger competitors, she only produced quite a few notable results in her entire career.
ISML: One of the stronger mid-tier girls in the scene. However, she is prone to choking out, and occasionally bows out of the competiton earlier than expected.
Best Girl Contest: Her peak performance was when the UBW anime aired between the years 2014-2016 (corresponding to BG1, BG2, and BG3). Saber reached the final in Best Girl 2, only to lose in a close-fought battle against Yukino Yukinoshita, prompting mass amounts of spilled salt released from her fanbase. Today, Saber's strength is gradually falling by the wayside. Her last hope of regaining her former glory is through Heaven's Feel.
Bilibili Moe: The Fate franchise is absolutely, massively popular in China. As the face of this franchise, Saber is the undisputed strongest girl bar none. Even Rin Tohsaka, her rival who constantly beats her more often than not, is no match inside this battlefield. Saber won her first major title here through the inaugural 2015 edition, the highlight match being a BLOWOUT finals victory against her aformentioned closest rival.