If Richard Hidalgo is considered an obvious one-year wonder, Brady Anderson would fit that same description multiplied by at least five. His 1996 season is far above all his other seasons combined.
Anderson was the Orioles' leadoff-hitting center fielder in the 1990s and played almost his entire career with them. He was mostly known as a line-drive hitter with speed, as evidenced by his pre-1996 high of 21 home runs and 80 RBI in 1992. He also had a career high 53 stolen bases that year as well.
A year after hitting 16 home runs and driving in 64 RBI in 1995, Anderson emerged as one the year's best hitters in 1996 and instantly became a dual threat with his speed and new found power.
That year, Anderson set all kinds of career highs by batting .297 with 117 runs scored, 37 doubles, 50 home runs, 110 RBI, a 1.034 OPS and 369 total bases. He set the Orioles' new single season home run record and also became the only player to ever be part of the 50-20 club and the 20-50 club.
After his memorable 1996 season, Anderson did not have any more seasons as good as that one. He batted .288 with 18 home runs and 73 RBI while dealing with a broken rib in 1997. In 1998, his numbers slipped to a .236 average, 18 home runs and 51 RBI. Anderson then bounced back decently in 1999 with a .282 average, 24 home runs and 81 RBI.
After a subpar 2000 season, Anderson really declined in 2001 and hit even worse in 2002 as a member of the Indians before retiring.
Through his career, Anderson averaged a .256 average, 19 home runs and 67 RBI, which goes to show how remarkable his 1996 season really was in comparison to his career averages. As a result, many people have speculated that Anderson may have used performance enhancing drugs during the 1996 season, which could have helped him hit with more power. However, Anderson has long denied such claims and has stated that he simply had more good swings that season than in other seasons.
Regardless of whether the performance enhancing drugs claims are true or not, it's very hard to argue against Brady Anderson being the most suspicious one-year wonder ever in baseball history.