- Reus nets Dortmund's first goal of 2017.
- Pulisic, Kagawa and Schürrle on target in convincing win.
- Schmelzer lays out plans for a more solid year.
Thomas Tuchel fielded different teams in each half and Pulisic was the standout performer of the second 45 minutes with an eye-catching goal to round off a win which augurs well for a bright 2017, both for the USMNT midfielder and the Westphalians.
Marco Reus missed a penalty in the 18th minute, but he made up for it soon after to give Dortmund the lead. Shinji Kagawa added a second just before half-time with Tuchel's men finally converting some of their growing number of chances, thanks to two assists from Adrian Ramos.
The Estadio Municipal de La Linea de La Concepcion witnessed Andre Schürrle's first goal since 27 September, when he netted against Real Madrid CF in the UEFA Champions League, as Dortmund moved three goals clear of their opponents, only to be pegged back by former Borussia Mönchengladbach forward Luuk De Jong.
The outstanding Pulisic had the final word with Dortmund's fourth, with Mikel Merino and Schürrle both involved in a slick build-up for a goal which rounded off a fine start to the new year for Die Schwarzgelben.
BVB – who are without Pierre-Emerick Aubameyang while he prepares to represent Gabon at the Africa Cup of Nations – will continue to sweat it out in Marbella until 13 January before returning to Germany with one week left to prepare for their Matchday 17 trip to SV Werder Bremen.
Watch: Who can catch Aubameyang in the Bundesliga top-scorer race?
One of their priorities has been their defensive work with Marcel Schmelzer saying that the "primary objective is not to fall behind so often, particularly not with the opponents' first shot of the game, because then you can win games with just one goal and not need two," and Saturday's workout suggests they may be getting things right.