Neither lineup is whole, either. Boston is patching around injuries to Willson Contreras, Curtis Mead and Ceddanne Rafaela, while leaning on trade-deadline catcher Adley Rutschman, who's himself day-to-day with an elbow issue. Baltimore has been without Christian Franklin and Tyler O'Neill in the outfield, and its bullpen took a hit when Ryan Helsley and Felix Bautista both landed on the 60-day injured list.
Boston's season has been a wild swing in both directions. Interim manager Chad Tracy took over an under-.500 club in late April and turned it into one of the better teams in the American League through the summer, a run good enough to put him in the Manager of the Year conversation. But the last stretch has been rough — Boston dropped 3 of 4 to the Yankees in the Bronx, and enters this weekend having lost 2 straight.
Baltimore's story is simpler: general manager Mike Elias sold off pieces at the deadline, including Rutschman, Taylor Ward and Tyler Wells, and the Orioles have played out the string as a sub-.500 club since. That doesn't mean they've stopped competing — they've won 3 of their last 5, including a strong showing against the Athletics — it just means every game from here is about the young players getting reps, not the standings.
Shane Baz signed a 5-year extension with Baltimore back in the spring, which makes him one of the few building blocks left after the sell-off — worth watching regardless of what the scoreboard says Friday night. For Boston, every game left is a playoff-race game, and how healthy this lineup and bullpen look down the stretch may matter as much as any single result at Camden Yards.