They are a formidable duo.

They make an odd, but formidable, duo.

Chrebet did not miss a game in his previous four seasons, and had formed a durable, formidable duo with the irrepressible Johnson.

Later he formed a formidable duo in the defence with Ernst Happel, who as coach went on to achieve legendary status in the 1970s and 80s.

He and Edberg are a formidable duo, pursuing the Swedish Grand Slam.

Despite their differences and personal conflicts, the two make a surprisingly formidable crime-fighting duo, and slowly realize that they have a lot to learn from each other.

Goaltenders Hrudey and Smith have been a formidable duo in the past for the Islanders.

While at Racing, he formed a formidable duo with diminutive veteran forward Pedro Munitis, and netted 12 league goals during the 2006-07 season.

Aarones and Pettersen form a formidable duo of strikers in the middle of the Norwegian attack.

He and Basil McRae were a formidable duo on the Minnesota North Stars at the end of the 1980s.