Mitchell Boggs has three saves in four opportunities, while Sanchez and Fernando Salas both have two in as many chances. Ryan Franklin and Trever Miller also have one save apiece.
Manager Tony La Russa likes his options in the bullpen and doesn't seem like he will name a closer anytime soon.
"I just look at who's available," La Russa said Tuesday. "There are several guys throwing the ball well."
But he's watching his cast of bullpen arms closely.
"They are all part of our depth and they are all going to be used in those situations, and every time they are used in the seventh or eighth or glamorous ninth, you are evaluating how they do," La Russa said.
The bullpen has combined to go 5-8 with a 2.96 ERA in 95 1/3 innings, with 41 runs (31 earned) on 92 hits, 81 strikeouts and 39 walks.
In the first two games of the Marlins series, the Cardinals used six relievers -- Salas, Boggs, Miller, Sanchez, Miguel Batista and Jason Motte -- who combined to allow two runs on seven hits over seven innings.
Sanchez impressed Marlins manager Edwin Rodriguez on Tuesday.
"He has a very good fastball with a lot of movement," Rodriguez said. "And he had a lot of composure. He's legit. He was out there with first and second, and he made very good pitches. I like what I saw from him."