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Eat your spinach and you too can add lots of muscles just like these big leaguers! We thought it would be fun to see what some of today's top sluggers looked like on their rookie baseball cards, beginning with Jason Giambi, when he was a 20-year-old third baseman for Team USA:

Then: 1991 Topps TradedNow: First baseman, Yankees
Then
Now
Home runs as rookie: 6
Career home runs: 269