On Nov. 28, the Padres dealt reliever Cory Burns to the Rangers for a player to be named. That player is Boscan, a 23-year-old who is 38-44 with a 4.00 ERA over parts of six professional seasons.
Boscan was eligible for the Rule 5 Draft on Thursday but was not selected, thus paving the way for the two teams to complete their deal.
Boscan was 7-5 with a 3.75 ERA in 34 games (nine starts) with the Rangers' Double-A affiliate in Frisco in 2012. He had 89 strikeouts in 98 1/3 innings.
Burns was designated for assignment by the Padres on Nov. 20, meaning the team had 10 days to either trade, release or place him on waivers for the intention of giving him his outright release.
Burns, 25, appeared in 17 games with the Padres last season, compiling a 5.50 ERA in 18 innings with 18 strikeouts and 10 walks. He spent the majority of the season with Triple-A Tucson, going 1-2 with a 3.14 ERA over 54 appearances with 78 strikeouts in 66 innings.
The Padres obtained Burns last December, sending outfielder Aaron Cunningham to the Indians. Over parts of four Minor League seasons, Burns is 7-11 with a 2.36 ERA.