Dak Prescott has a lot on the line in 2018. The Cowboys QB may have established himself as a franchise level player, but he's still on his extraordinarily cheap rookie deal and could be due for a huge pay rise next season. Stephen Jones, the Cowboys' Executive VP, said last week that the organisation will be ready to pay Prescott what he deserves in 2019, but he'll still have to prove that he's the man to carry them forward. Prescott will earn just over $780,000 this season, which ranks 74th amongst NFL signal callers. He's clearly a top 15 player at his position though, so the pressure is on him to prove that he deserves to paid like just that come 2019. But, the always calm and collected former fourth-round pick doesn't seem to be feeling under scrutiny and revealed a pretty lofty career goal of his in response to Jones' comments. "It’s not any pressure, I want to be the best I can." Prescott told Sportsday's John Machota at the team's annual charity Home Run Derby. "I want to be the best quarterback that the Cowboys ever had. So when I go in each and every day, it's just about being the best player I can be. All that stuff comes when you play the game well."Considering the quality of his predecessors in Dallas, that's a pretty bold statement to make. The Cowboys have been blessed with two Hall of Fame QB's in their history, Roger Staubach and Troy Aikman, as well as four-time Pro Bowler Tony Romo. Staubach and Aikman delivered two and three Super Bowls to Dallas respectively, and if Prescott wants to be considered the greatest ever Cowboys QB he'll certainly have to better those totals. 

Though it's unlikely he'll top the three titles that Aikman won given the level competition in today's NFL, and the NFC in particular, Prescott's first two years as a pro have seen him do things that nobody in NFL history has ever done. 

Should his career trajectory keep rising and he wins a Super Bowl, he'll certainly be in the conversation as a Hall of Famer and then it'll be impossible to not consider him as a Cowboys great. 

Through two years in the NFL, he's thrown for 6,991 yards, 45 touchdowns and just 17 interceptions, while adding 639 yards and 12 touchdowns on the ground.

He also owns a series of NFL rookie and full records including; most passes attempted without an interception to start a career (176),  most games as a rookie with a passer rating over 100 (11), rookie passer rating (104.9), rookie TD to interception ratio (5.75), and rookie pass completion percentage 67.76%. 

It'll take consistent elite individual and team performances, including multiple divisional titles and Super Bowl appearances and wins, for Prescott to truly be considered the greatest ever Cowboys QB.

It's certainly ambitious, but not impossible.