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By Jon Weisman

With six days until Major League rosters can expand, pitchers Jharel Cotton and Julio Urias continue to make strong cases for a callup.

Dodger manager Don Mattingly told reporters today that even if the 19-year-old Urias comes up this year, he won’t be part of the initial wave September 1. We’re assuming the Dodgers will stick with that approach, even though Urias then pitched six innings of shutout ball tonight for Double-A Tulsa in a 1-0 loss to Arkansas.

Urias allowed four hits, walked none and struck out three, throwing 76 pitches (12.7 per inning). His August ERA is 1.98, with 30 baserunners allowed in 27 1/3 innings against 25 strikeouts.

The 23-year-old Cotton might be another story, because unlike Urias, he needs to be added to the 40-man roster this offseason. Recently promoted to Triple-A Oklahoma City with an eye on his potential as a September addition, Cotton — who is profiled in the soon-to-be-released September issue of Dodger Insider magazine — came out of the bullpen and faced nine batters, allowing two singles and a walk while striking out all other six.

As gravy on the cake, Cotton came to bat in the seventh inning and hit a two-run triple. Before making his Triple-A debut tonight, Cotton had a 2.30 ERA with 71 strikeouts 62 2/3 innings for Tulsa.

Corey Seager, another interesting farmhand to say the least, hit his third homer in five games in Oklahoma City’s 8-2 victory against Pacific Coast League Old Friend Albuquerque. Seager is 14 for 45 (.311) in his last 10 games with 26 total bases, one walk and 11 strikeouts, for a .326 on-base percentage and .578 slugging percentage.

Seager, who plays third base and shortstop, homered on the same night that the Dodgers’ big-league third baseman and shortstop, Justin Turner and Jimmy Rollins, homered in a 5-1 victory at Cincinnati.