Borussia Dortmund are bracing for their two most important matches of the season. Saturday's game at RB Leipzig in the Bundesliga is followed by a Champions League semi-final first leg at home to Paris-Saint Germain on May 1. With the league title already wrapped up by runaway leaders Bayer Leverkusen, attention has shifted to the battle to qualify for the European competitions next season. Dortmund's unexpected success in Europe has thrilled fans but the team's future in the continent's top club competition beyond this term could rest a lot on the result against Leipzig.