2017–18 Primeira Liga
The 2017–18 Primeira Liga (also known as Liga NOS for sponsorship reasons) was the 84th season of the Primeira Liga, the top professional league for Portuguese association football clubs. Benfica were the defending champions for a fourth consecutive time, but they did not retain the title. Porto became the new champions with two matches to spare, clinching their 28th league title. This was their first trophy in four years.
| Season | 2017–18 |
|---|---|
| Dates | 6 August 2017 – 13 May 2018 |
| Champions | Porto 28th title |
| Relegated | Paços de Ferreira Estoril |
| Champions League | Porto Benfica |
| Europa League | Sporting CP Braga Rio Ave |
| Matches played | 306 |
| Goals scored | 826 (2.7 per match) |
| Top goalscorer | Jonas (34 goals) |
| Biggest home win | Braga 6–0 Estoril (1 October 2017) |
| Biggest away win | Estoril 0–6 Braga (3 March 2018) |
| Highest scoring | Porto 5–2 Portimonense (22 September 2017) Belenenses 3–4 Sporting CP (15 April 2018) |
| Longest winning run | 9 matches Benfica |
| Longest unbeaten run | 23 matches Porto |
| Longest winless run | 11 matches Estoril |
| Longest losing run | 8 matches Estoril |
| Highest attendance | 63,526 Benfica 0–1 Porto (15 April 2018) |
| Lowest attendance | 942 Estoril 0–0 Portimonense (4 December 2017) |
| Total attendance | 3,655,213 |
| Average attendance | 11,945 |
← 2016–17 2018–19 → | |
Since Portugal dropped from fifth to seventh place in the UEFA association coefficient rankings at the end of 2016–17 season, only the two best-ranked teams could qualify for the UEFA Champions League (the champions entered directly into the group stage, and the runners-up entered the third qualifying round). The third and fourth-placed teams qualified respectively to the UEFA Europa League third and second qualifying rounds.