As they blow by the Memorial Day checkpoint, Brian Snitker holds the lead, with Clint Hurdle running second and Mickey Callaway third. Buck Showalter and Ned Yost appear to have fallen off the lead lap. Of the seven Mississippi-connected managers at the wheel of a big league club, only Atlanta’s Snitker, Pittsburgh’s Hurdle and the New York Mets’ Callaway reached Memorial Day with a winning record. Showalter’s Baltimore team, after losing on Monday, is 20 games under .500. Yost’s Kansas City team is 18 under. Toronto, under John Gibbons, is hanging tough at 25-29, and Ron Gardenhire has steered Detroit to a 24-29 mark, exceeding expectations in his first year there. To be fair, expectations weren’t high for any of these seven clubs. The first-place Braves, under former Mississippi Braves skipper Snitker, are a relatively young bunch running ahead of schedule. It’s a solid team – currently ranked No. 5 in mlb.com’s latest power poll — but they’ll be challenged in the National League East to hold off Washington, Philadelphia and perhaps even the Mets, who are in the charge of ex-Ole Miss star Callaway, brand new to the job. Despite a spate of adversity (check their disabled list), the Mets are 26-25 and just 4 games back of Atlanta. Former Jackson Mets manager Hurdle has done a fine job with the Pirates, who are contending in the NL Central even after trading away stars Andrew McCutchen and Gerrit Cole. Meridian Community College product Corey Dickerson, acquired in a preseason trade, has been one of the Bucs’ best hitters. Gardenhire, a former Jackson Mets shortstop and veteran MLB manager, has the outmanned Tigers just 3½ games off the pace in the American League Central. Former JaxMets catcher Gibbons’ Blue Jays, while just 4 games under .500, are 12 games back of Boston in the AL East. It’s already been a long season for Mississippi State product Showalter and JaxMets alum Yost, both of whom could use an extended pit stop to make repairs. P.S. Ex-MSU star Hunter Renfroe, out over a month with an elbow issue, returned to San Diego’s lineup on Monday and went 1-for-4 with an RBI.