2010s- Johnny Oduya
The 2010s was a productive decade for the most part for the Senators as they made the playoffs four times and made the 2017 Eastern Conference Finals. After losing to the Penguins in seven games in the 2017 Conference Finals, the Senators were looking to add a productive defenseman who can play defense and occasional offense when needed.
To do that, the Senators signed veteran Johnny Oduya to a one-year contract in 2017. Oduya was a two-time Stanley Cup champion who had played for four different teams before the Senators signed him, but was well respected by his teammates.
The Senators had hoped Oduya would be a mentor on the Senators' blue line and bring championship pedigree. Unfortunately, Oduya's tenure with the Senators was a very forgettable one.
At 36 years old, Oduya only played in 51 games for the Senators and recorded just eight points. The Senators didn't reach the playoffs in 2018 and it was the beginning of the playoff drought for the Senators. The Senators traded Oduya to the Philadelphia Flyers mid-season and he would only play one game for the Flyers.
After 2018, Oduya never played again in the NHL. While Oduya had positive stints with the Chicago Blackhawks and Dallas Stars before joining the Senators, his Senators tenure went poor.