On Wednesday, Nelson Baptista's men clinched glory in the Sugura Bank Championship, defeating Argentine outfit Lanus in the final on home soil.
Kashiwa's victory ensured the annual event contested between the winners of the J-League Cup and the Copa Sudamericana was won by a Japanese side for the fifth year in succession.
Brazilian Leandro was the hero, converting a second-half penalty after Tatsuya Masushima's own goal had cancelled out Kaoru Takayama's opener.
"Personally I didn't play that well but the team won so I am glad," said Takayama. "The [first] goal was Leandro's really. All I had to do was run it in."
Kashiwa currently sit eighth in the J-League, while Yokohama, who blew a title-winning position to finish second last season - are four points behind their opponents in 11th.
They will aim to continue their strong form by beating struggling Omiya Ardija, who have failed to register a win in that time.
A fifth consecutive win for Gamba could leave them just one place shy of the AFC Champions League qualifying berths, with two of the sides in those spots set to meet at the weekend.
At the foot of the table, Tokushima Vortis will seek to reduce the 10-point between themselves and safety when they take on Shimizu S-Pulse.
The league's bottom club have picked up only nine points all season, but four of those have been gained from their last two fixtures.
Ninth-place Vissel Kobe are yet to pick up a win since the league resumed, a run which they will hope to end at home to Albirex Niigata.
Elsewhere, Kashima Antlers visit Nagoya Grampus and Ventforet Kofu are set for a clash with Vegalta Sendai.
