On August 29th, 1984, the upstart Minnesota Twins held a 3 game lead in the AL West division. In a bid to shore up their bench, the Twins traded a PTBNL to the Seattle Mariners for 30 year old PH/DH/1B Pat Putnam, who had a paltry .532 OPS for the Mariners.
Well, Putnam's OPS in 43 AB's was almost half that for the Twins (.268!). As we all know, the Twins proceeded to lose the division to Cleveland and Jamie Quirk.