It was the Costa Rican fullback's second goal in two games.
Martinez said: "It's a great example. In football you need to go through disappointments, bide your time and wait for an opportunity. Bryan has shown that strength.
"It's been frustrating for him but he has shown he's ready and taken the opportunity to help the team.
"He has brought two goals in two games but more importantly he's show the defensive concentration in those games too. He's a real example."
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