NORMAN — Sydney Berzon is entering the postseason hoping to build on one of her best outings of the season. In the second game of Saturday’s doubleheader in College Station, Berzon pitched five scoreless innings.  She recorded a season-high five strikeouts in her longest outing of the year, both by innings and pitches (61), and she surrendered two hits and no free passes.  Her 57 1/3 innings pitched for the season is by far the smallest workload she’s ever gotten, falling well below last year’s 139 1/3 innings pitched, but Berzon is confident that she’s properly ramping up as postseason play arrives.  “My goal all the time is to keep improving,” Berzon said on Tuesday. “Keep learning from games, innings, even practice.…