Barcelona won the treble in the 2014–2015 season, winning <answer>La Liga</answer>, Copa del Rey and UEFA Champions League titles, and became the first European team to have won the treble twice. On 17 May, the club clinched their 23rd <answer>La Liga</answer> title after defeating Atlético Madrid. This was Barcelona's seventh <answer>La Liga</answer> title in the last ten years. On 30 May, the club defeated Athletic Bilbao in the Copa del Rey final at Camp Nou. On 6 June, Barcelona won the UEFA Champions League final with a 3–1 win against Juventus, which completed the treble, the club's second in 6 years. Barcelona's attacking trio of Messi, Suárez and Neymar, dubbed MSN, scored 122 goals in all competitions, the most in a season for an attacking trio in Spanish football history.
What competition did Barcelona win on May 17 of the 2014-15 season?
La Liga