Barry Bonds's 73 home runs in the 2001 season are the most hit in any single season. Baltimore Orioles first baseman Chris Davis has 37 home runs heading into the All-Star break, prompting discussion of his chances of breaking the all-time record.
For some, though—including Davis himself—the Orioles slugger is being measured not against Bonds's 73 home runs, but rather the 61 hit by Roger Maris in 1961. Bonds's total, along with that of 61+ sluggers Mark McGwire and Sammy Sosa, is being disregarded amid hand-wringing over the sport's problems with performance-enhancing drugs.
But proponents of the Maris argument actually hurt the integrity of the sport by giving the role of PEDs in baseball far more credit than it deserves or has ever been given before. Davis' 37 home runs have him on pace to hit more than Maris, but fewer than Bonds—the first time this has happened since Bonds broke the record, and the first time the Maris vs. Bonds debate actually matters.
To be sure, MLB has a high-profile history of doping—enough that President George W. Bush explicitly called it out in his 2004 State of the Union address. Almost a decade later, the sport still has its share of PED problems; it is reportedly set to suspend several players after the All-Star break for their alleged involvement with a Miami clinic providing drugs. Stranger still, the suspensions circumvent MLB's own rules governing PED testing and punishment. That said, there are positive tests each year that demonstrate that doping still exists in baseball, though to a lesser extent than when PED use was at its peak in the 1990s and early 2000s.