Segura, who moved up the Angels' rankings after Mike Trout was promoted, went 2-for-5 with his Texas League-leading 18th stolen base. He singled home Rian Kiniry in the second for a 2-0 lead after Jimmy Swift scored on a passed ball, scored the Travelers' third run in the fifth on Casey Haerther's double and added a two-run single in the sixth, knocking in Adam Heether and Angel Castillo.
Pena, the Angels' No. 15 prospect, turned in another solid outing, holding the Naturals to five hits over six innings for his second win. The right-hander, who turned 23 on Sunday, struck out eight and did not walk a batter. It was the second time in four starts in which Pena has not walked a batter after he had walked 13 in 27 1/3 innings over his first five Double-A starts.
Segura, a converted second baseman who missed much of last season with a hamstring injury, began the season ranked by MLB.com as Los Angeles' No. 2 prospect behind Trout. The shortstop is batting .275 as Arkansas' leadoff man, with four homers, 18 RBIs and 46 hits in 43 games.
An Arizona Fall League Rising Star last year, Segura ranks 50th in MLB.com's overall prospect rankings and No. 7 among shortstops following his 2011 campaign in which he hit .293 with four homers, 26 RBIs and 18 steals in 52 games for Class A Advanced Inland Empire and the Angels' Arizona League affiliate.
Pena (2-4) lowered his ERA to 3.61 and has now held opponents to three earned runs or fewer in seven of his nine starts this year. He's struck out seven or more in five of those outings.
Naturals starter Ethan Hollingsworth took the loss, allowing four runs -- two earned -- on four hits and a walk in 4 2/3 innings.