Northern Irish club Linfield have secured a famous 1-0 Europa League win against Xanthi in the first-leg of the second qualifying round.
Blues manager David Jeffrey had admitted concerns over the heat's impact on his players in the build-up to the match in Greece.
However, Aaron Burns grabbed the winner in just the 25th minute, firing past Christian Gimenez after good work down the left.
There was another shock result in Scandinavia, where Frazer Wright secured St Johnstone a 1-0 victory against 22-time Norwegian champions Rosenborg.
Derry were another to impress in Europe as they gave Trabzonspor a scare before finally falling 4-2.
There was also a 2-0 defeat for Hibernian, who face an uphill battle in next week's second leg tie with Malmo, while Prestatyn Town's task next week looks nigh on impossible after suffering a 5-0 hammering to Rijeka.
Meanwhile, there were wins for Standard Liege, Hajduk Split, Thun, Hapoel Tel-Aviv, Dila, Irtysh, Lokomotiva Zagreb, Skonto, Tromso and Maccabi Haifa.
However, Eredivisie side Utrecht suffered a shock 2-1 defeat to Luxembourg side FC Differdange.
Information from the Press Association was used in this report.