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Saturday's power rankings

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Rizzo the hero for Cubs on Saturday

Anthony Rizzo's three-run homer in the ninth, in a six-RBI night, was the difference in the Cubs' 9-6 victory over the Diamondbacks.

1. Anthony Rizzo, Chicago Cubs: In the Cubs' 9-6 win over Arizona, Rizzo delivered a bases-clearing double that was almost a grand slam, plus a game-winning three-run home run. As his postgame comments indicate, he can't help but let people know he is enjoying himself as he comes into his own as one of the game's premiere players. As the recency phenomena associated with the arrivals of Kris Bryant, Addison Russell and Jorge Soler wear off, there is still the fun of seeing whether Rizzo will be the best of them. Check back in a dozen years or more, and enjoy the ride in the meantime.

2. Houston Astros infielders: In the Astros' 3-2 win over the Tigers, Jonathan Villar started a 5-4-3, fifth-inning triple play by cleanly picking up Ian Kinsler's grounder, tagging the base and firing to Jose Altuve covering second. The play squelched what was shaping up to be a big inning for Detroit, which had already pushed a run across to take the lead. But instead, it was a frame that could have ruined Lance McCullers' start and led to a loss. Yes, it was the Astros' first triple play in more than a decade, which pretty much automatically gets it onto a list such as this, but it also reflects that the Astros are more than the Three True Outcomes at the plate. They're also picking it on D. Through Saturday, the Astros are tied with the Tigers for second in the AL in double plays, they're above average in Defensive Efficiency, and they're 10th in MLB in Baseball Prospectus' Park-Adjusted Defensive Efficiency.

3. Mike Napoli, Boston Red Sox: A two-homer day against lefty C.J. Wilson by the fuzzy faced first baseman couldn't have come at a better time for the Sox, as it helped sew up their 8-3 win over the Angels. Napoli has endured a terrible start to his season -- the two homers got him up to .677 OPS on the season -- and the situation was a case of his delivering what you want to expect from him and pulling something soft from a southpaw far over the Monster. That said, Napoli didn't have a ton of past success against him former teammate, having only homered against Wilson once before (in 2010) and managing a .679 OPS in 37 career plate appearances.

4. Mike Bolsinger, Los Angeles Dodgers: Reasonably, most thought the Dodgers took a risk in signing famously fragile hurlers such as Brandon McCarthy and Brett Anderson to round out their rotation, so you had to wonder whom they'd turn to when one or both broke down. Answer? Bolsinger. After shutting down the Padres in a 2-0 win in his latest turn -- one-hitting them over eight innings -- the D-backs castoff has given the Dodgers four strong spins and is generating twice as many ground balls as fly balls. Seeing as Bolsinger basically lives in the slow lanes -- with an 87 mph cutter, a curve -- it might be tough to rely on a finesse righty all season. But for a replacement starter, it would be hard to imagine anyone doing better, and with these results already in the books, the Dodgers shouldn't question their good sense or good fortune in getting him.

5. Cole Hamels, Philadelphia Phillies: He earned his fourth straight start (this one at the Nationals' expense) to run his record to 5-3 and get his ERA under 3.00. I think we can dispense with fretting about whether his slow start is going to hamper any effort to get him traded.

Christina Kahrl writes about MLB for ESPN. You can follow her on Twitter.