MADRID, Jan. 6 (Xinhua) -- The third round of the Copa del Rey knockout tournament produced some upsets this weekend, but so far most of the main favorites have progressed to the last-16. Here are four things we learned this weekend in Spain.

1. Barcelona keeps focus after difficult week

FC Barcelona may be immersed in chaos off the pitch with its failure to register Dani Olmo and Pau Victor in its first team squad due to financial pair play rules, but coach Hansi Flick deserves credit for keeping the rest of his squad focused.

Barcelona produced a professional display to win 4-0 away to fourth tier Barbastro on Saturday, with Flick fielding a strong side to avoid risks against a rival it only beat 3-2 last season.

Flick will have been pleased to see Pablo Torre step up into Olmo's role with an impressive display, while the return of Ronald Araujo gives him more options to rotate a defense that has had a hectic first half to the season.

2. Logrones pushes Cup holder Athletic Club to the limit

Athletic Club Bilbao coach Ernesto Valverde said ahead of the defending champion's Copa del Rey debut away to fourth tier Logrones that games against lower division rivals made him "panic", and 120 minutes in the Las Gaunas Stadium showed that Valverde was right to worry.

He gave minutes to several fringe players in Saturday's game and although Athletic never suffered in defense, on a dry and slow pitch it was unable to impose the speed needed to score against a side that has only conceded nine goals all season and who knocked Girona out on penalties in the previous round.

Logrones took the game to a penalty shootout, where Athletic goalkeeper Julen Agirrezabala was again his side's hero as in last season's final, but Valverde won't want a repeat of that lottery in the next round.

3. Las Palmas crashes out again

Las Palmas' visit to in-form second division Elche always threatened to be an upset, with the visitor more focused on assuring top-flight survival, rather than progressing in the Copa del Rey.

Nevertheless, few would have expected Elche to hammer the visitors 4-0, with Las Palmas giving a display that implied it has suffered an eight-hour flight, rather than the two and a half hours it takes to fly to Spain from the Canary Islands.

The cup is clearly not for Las Palmas as this is the seventh consecutive year it has failed to make the last-16, implying the tournament is clearly not on its agenda.

4. Other top-flight sides also pay price

The Sevilla fans who followed their team to Almeria demanded explanations from their players after a 4-1 humiliation to second division leader Almeria, who completely outplayed it after falling behind to an early goal.

Bottom of the table Valladolid showed the depth of its problems as it allowed Ourense to twice come from behind to win 3-2, while fourth tier Pontevedra completely outplayed last season's beaten finalist, Mallorca, who also looked as if it would rather have not got off the plane. ■