Question: which league is the 121th season of top-tier competitive football in Switzerland which Ulrich Forte coach FC Zürich in the league 

Context:
Letzigrund
   is a stadium in Zürich, Switzerland, and the home of the athletics club LC Zürich, and the football clubs FC Zürich and Grasshopper Club Zürich.
 LC Zürich is a spin-off of FC Zürich whose members constructed the stadium in 1925.
 Grasshopper-Club is using it as their home stadium since 2007.
 The annual athletics meet Weltklasse Zürich—part of the IAAF Diamond League—takes place at the Letzigrund since 1928, as well as frequent open-air concerts.
 On the Letzigrund track on 21 June 1960, Armin Hary was the first human being to run the 100 metres in 10,0 seconds.
2015–16 Manchester City F.C. season
The 2015–16 Manchester City season was the club's 114th season of competitive football, its 87th season in the top division of English football and its 19th season in the Premier League since the League creation, with Manchester City as one of the original 22 founder-members.
 Along with the Premier League, the club also competed in the UEFA Champions League, FA Cup and League Cup.
 The season covers the period from 1 July 2015 to 30 June 2016.
2016–17 Manchester City F.C. season
The 2016–17 season was Manchester City's 115th season of competitive football, 88th season in the top division of English football and 20th season in the Premier League since the league was first created with City as one of the original 22 founder-members.
 They competed in all three domestic competitions, as well as the UEFA Champions League for the sixth year in a row.
2013–14 FC Basel season
The 2013–14 FC Basel season is the 121st season in club history and the club's 19th consecutive season in the top flight of Swiss football.
 Basel are the reigning Super League champions.
 They started their season with various warm-up matches against teams from Switzerland, Serbia and Germany.
 Their 2013–14 Swiss Super League season began on 13 July with the home tie against FC Aarau and after the first six rounds they occupied just the fourth position in the league table, six points behind the leader Young Boys Bern.
 Beating the Young Boys in the seventh round, Basel started a run of 29 league games without defeat.
 At the end of the season Basel won the league championship for the fifth time in a row.
 They started in the 2013–14 Swiss Cup first round on 17 August with the away game against BSC Old Boys.
 Beating the Old Boy (1-0 after extra time) and after beating Münsingen 1–0 in the next round, they faced Tuggen in the third round, winning 3–1.
 In the quarterfinals they played in against FC Le Mont, winning 6–1 and qualified for a semifinal home tie in St. Jakob-Park against Luzern on 26 March.
 They reached the final, but were beaten 2–0 by Zürich after extra time.
2009–10 Swiss Super League
The 2009–10 Swiss Super League is the 113th season of top-tier football in Switzerland.
 The competition is officially named "AXPO Super League" due to sponsoring purposes.
 It began on 11 July 2009 and has ended in May 2010.
 FC Zürich were the defending champions.
 The title was won by FC Basel.
2014–15 Kitchee SC season
The 2014–15 season was the 36th season of top-tier competitive association football played by Kitchee SC, a professional football club based in Mong Kok, Kowloon, Hong Kong.
 Their first-place finish in the Hong Kong Premier League meant it was their second successive championship in Hong Kong's top division, and seventh overall.
2006 Basel hooligan incident
The 2006 Basel hooligan incident (often called "Disgrace of Basel") occurred on 13 May 2006 in Basel, Switzerland.
 On that day hooligans supporting the Swiss football club FC Basel 1893 stormed the field of the St. Jakob-Park after a championship-deciding match against the FC Zürich.
 FC Zürich scored in the dying moments of the match and won 2–1.
 The goal ended the dream of Basel winning the Swiss Super League a third time in a row.
 This resulted in property damage and riots between hooligans of both the FCB and their rival supporters after the match.
 This riot is considered as one of the worst incidents involving hooliganism in Swiss sport to date.
2017–18 Swiss Super League
The 2017–18 Swiss Super League (referred to as the Raiffeisen Super League for sponsoring reasons) is the 121th season of top-tier competitive football in Switzerland and the 15th under its current name and format.
 Basel are the defending champions.
Ulrich Forte
Ulrich "Uli" Forte (born 15 September 1974 in Wangen-Brüttisellen) is an Italian football coach and former player.
 He is currently the coach of FC Zürich in the Swiss Super League, having successfully led to club to promotion in the 2016–17 Swiss Challenge League.
FC Zürich Frauen
FC Zürich Frauen is a women's football Club from Zürich, Switzerland.
 Its first team plays since the founding of the Swiss national league in 1970 in the first division.
 The team won 20 national championships and won the Cup 12 times.

Answer: 2017–18 Swiss Super League