What was the biggest reason the Miracle Mets stunned the Orioles in 1969?

1969 Mets World Series poll options

1969 Mets World Series

'Miracle Mets' first title, beat heavily-favored Baltimore Orioles 4-1

New York Mets

• Seaver and the pitching staff
• Clutch hitting in key moments
• Defense and fundamentals
• Pure belief and team chemistry