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The Phillies' worst-case scenario played out Saturday night as Bryce Harper suffered a fractured left thumb & is out indefinitely.

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Harper was hit in the thumb by a 97 mph Blake Snell fastball in the fourth inning in San Diego 

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He immediately fell to the ground, clutching his left hand and writhing in pain. 

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Visibly frustrated, Harper said something to Snell, who was apologetic and replied that it was unintentional. 

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Harper shouted back to Snell that he knew it was not on purpose. 

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He will be re-evaluated in the coming days to determine the path to recovery and whether surgery is required.

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Harper is as irreplaceable as any player in baseball.  

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The Phillies just got a taste of it earlier this week when they scored a combined five runs in three games he missed with a blister. 

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Harper has again been one of the best hitters in baseball 

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entering Saturday's game hitting .320/.385/.602 with 21 doubles, 15 homers and 48 RBI despite missing nine games. 

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He has six more extra-base hits than anyone in the majors since last year's All-Star break.