Seven different British men have now won Grand Slam men’s doubles titles since 2012.
At Wimbledon, Cash and Glasspool’s triumph follows that of Neal Skupski winning the title alongside Dutch partner Wesley Koolhof two years ago before Henry Patten and Finnish partner Harri Heliovaara last year.
Last month, Cash and Glasspool became the first all-British partnership to win the men’s doubles title at Queen’s in the Open era.
They followed that up with victory at Eastbourne and have won 17 matches on grass this season, losing just one.
“We have played a crazy amount of tennis on the grass,” Cash said.
“There was a lot of pressure on our shoulders. The fact we could do what everyone said we could is surreal.”
They have been the men to beat in the doubles draw this year, securing wins against defending champions Patten and Heliovaara in the quarter-finals and French Open champions Marcel Granollers and Horacio Zeballos in the last four.
On a packed Centre Court, Cash and Glasspool – superior in the net rallies and both displaying impressive serving – had the opening set wrapped up in just 27 minutes.
A break of serve in the fifth game of the second set before an emphatic love hold put them within two games of the title but Hijikata and Pel rallied, winning the next three games to put the match back on serve.
Cash and Glasspool saw off a deuce game at 6-5 to force a tie-break before sealing the win with their first of three championships points.