Keller's strong outing spoiled by no run support, walk-off in 10th inning

Tucupita Marcano reacts after being called out on strikes in the eighth inning Saturday in PhoenixPHOENIX -- Seven pitchers used. Fifteen strikeouts recorded.

The issue is, it didn't have to take the Diamondbacks' army of relievers to completely out-shine the darkness cast by the Pirates' offense Saturday at Chase Field.

It just happened to work out that way in Saturday afternoon's game, in which the Diamondbacks spoiled an efficient and in-character start by Mitch Keller by walking off the Pirates, 3-2, in 10 innings. Corbin Carroll's walk-off single to right field off of fellow All-Star David Bednar was the final blow that sent 31,801 fans home happy while the Pirates continue to look for…