It was only Mutyaba's second game in the Zamalek shirt, a test he surely passed with flying colours against the FIFA Club World Cup semifinalists.
Uganda Cranes midfield sensation gave a proper account of himself in one of the world's biggest football rivalries, as Zamalek SC tamed historical nemesis Al Ahly on Monday.
A Seifeddine Jaziri brace guided the White Knights past the Red Devils in the fiercely contested match at the Cairo International Stadium.
Substitute Ahmed Abdelkader netted Al Ahly's consolation against the eternal enemies in the Egyptian Premier League.
Mutyaba, who came on in the 17th minute for Zizo (Ahmed Mostafa Mohamed Sayed), vindicated every minute trusted with by head coach Jose Gomez.
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He last made the Zamalek match-day squad on February 29 on his debut as they beat Abu Salim 2-1 in the CAF Confederation Cup.
The 18-year-old played to Gomez's instructions, tracking back superbly as he offered fine effort going upfront, despite Zamalek having only 43% of the ball.
In the first-half, his quick feet drew a foul for a freekick just outside the box, which Ahmed Fotouh failed to convert.
In the 57th minute, Mutyaba drew loud cheers from the crowd after a winning the cleanly from Omar Kamal, who was seconds away from pulling the trigger in the box.
With Al Ahly chasing the game at the death, Mutyaba led a one-man counterattack from his own half into the latter's box, only for his shot to miss the target.
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Overall, SMASK played 10 games and won each one of them, scoring 38 goals and conceding none.
It was only Mutyaba's second game in the Zamalek shirt, a test he surely passed with flying colours against the FIFA Club World Cup semifinalists.
Following the victory, Zamalek are ninth with 21 points, while Al Ahly are ninth with the same tally in 13 and 11 games, respectively. Pyramids who are top with 32 points have played 15 games.
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According to the Stanbic Uganda Cup Regulations (the 47th Edition 2020/21), Article 45 (Revenue Sharing) permits for 40% apiece of the hosts and the visitors, with FUFA taking 20% of the gate collections.
Meanwhile, Mutyaba will hope to draw more minutes in Zamalek's next game against Dreams FC on April 21.