OCC champion Blandine L'Hirondel and series leader Stian Angermund head the line-up for the Golden Trail World Series Grand Final in El Hierro on Saturday.
Some of the world's leading trail runners have headed to the volcanic Canary island for the 32km finale to the series, in which double points will be available this weekend.
France's L'Hirondel, who won UTMB's 55km OCC race in August and is the current world trail champion from 2019, is sixth on the standings.
Switzerland's Maude Mathys leads the rankings, having won three races in the series so far this year.
They will face opposition from Netherland's Nienke Brinkman and France's Anais Sabrie, who lie second and third in the standings.
Norway's Angermund will be looking to maintain his unbeaten record in the series this year. Poland's Bart Przedwojewski, who is second on the standings, Italy's former Marathon du Mont Blanc winner Davide Magnini and this year's CCC third-placer Thibaut Baronian will be among those providing the toughest opposition.
2021 Golden Trail World Series standings
Women
1 - Maude Mathys (SUI) – 300
2 - Nienke Brinkman (NED) – 288
3 - Anais Sabrie (FRA) – 254
4 - Judith Wyder (SUI) – 241 (out)
5 - Blandine L’Hirondel (FRA) – 222
6 - Marcela Vasinova (CZE) – 221
7 - Sara Alonso (ESP) – 212
8 - Dani Moreno (USA) – 199
9 - Elise Poncet (FRA) – 197
10 - Caitlin Fielder (NZL) – 187
11 - Odile Spycher (SUI) – 183
12 - Iris Pessey (FRA) – 180
13 - Nuria Gil (ESP) – 177
14 - Anna-Stiina Erkkilä (FIN) – 174
15 - Karina Carsolio (MEX) – 160
Men
1 - Stian Angermund (NOR) – 300
2 - Bart Przedwojewski (POL) – 250
3 - Davide Magnini (ITA) – 234
4 - Remi Bonnet (SUI) – 219
5 - Elhousine Elazzaoui (MAR) – 209
6 - Thibaut Baronian (FRA) – 198
7 - Francesco Puppi (ITA) – 197
8 - Sylvain Cachard (FRA) – 180
9 - Frédéric Tranchand (FRA) – 176
9 - Jan Margarit Solé (ESP) – 176
11 - Roberto Delorenzi (SUI) – 169
12 - Anthony Felber (FRA) – 162
13 - Krzysztof Bodurka (POL) – 159
14 - Johann Baujard (FRA) – 156
15 - Christian Mathys (SUI) – 153