RJ Williams picks up three hits in series finale for Mavs.
UT Arlington and No. 18 Louisiana cap the Sun Belt series at 1 pm Sunday.
UTA now 2-1 in extra-inning games on the season after 4-2 win in 10 innings at Troy.
UTA next travels to Troy for a three-game series beginning Friday at Riddle-Pace Field.
Cox becomes the second UTA catcher to be named to the watch list, joining Greg McCall in 2014.