This from baseball reference on Ortiz and “Clutch” is maybe the best I can do for stats without expending a lot of effort.
Considering he’s got 105 hits on the year and 51 are from while the Brewers are ahead, I’d say there isn’t much difference for him. He’s been bad regardless of the situation, and since he’s getting a lot of ABs with runners on, that’s bad for the team. I don’t know if the numbers need much more parsing than that.