After equalling the mark of 202 in a row set by Ion Andoni Larranaga with Real Sociedad between 1986 and 1992, Williams broke the record in the home game against Alaves.
His tireless run began on April 20, 2016, in a match against Atletico Madrid at Bilbao’s San Mames home.
He then played in the four remaining games that season before featuring in five entire seasons, 2016-2017, 2017-2018, 2018-2019, 2019-2020 and 2020-2021.
In the current campaign, he has played in all eight top-flight games.
Before Friday, the 27-year-old had started 168 games and appeared as a substitute on 34 occasions.
He has scored 39 goals in his Bilbao career.