Spring training has come and gone in the Valley and it's time for regular-season baseball.
The Arizona Diamondbacks are coming off one of their most successful seasons in team history after reaching the NL Divisional Series last season.
But the team has seen quite a bit of turnover, and they'll need newcomers to produce at a high level if they want to reach the playoffs again.
Here are some key questions the D-backs will have to answer when they take the field, beginning Thursday night against the Colorado Rockies.
1. Can anyone replicate J.D. Martinez's bat work?
The short answer is no.
Martinez hit nearly one home run every two games in his short time as a D-back. He played only 60 games for Arizona and was the team's third-leading position player with 2.6 wins above replacement.
The Diamondbacks brought in Stephen Souza Jr. to fill Martinez's spot, but he almost certainly won't reproduce Just Dingers' impact at the plate.
It'll take a stronger season from multiple Diamondbacks to fill in Martinez's shoes now that he's with the Red Sox.
2. Can the rotation stay healthy?
In 2017, the Diamondbacks got 150+ innings out of five starting pitchers, four of whom posted earned-run averages below 3.50 in a fairly hitter-friendly ballpark.
It's not realistic to expect the same health luck this season, which means Arizona will have to rely on some minor-league arms or stretch the bullpen more than last year -- probably both.
3. Who's closing?
Speaking of the bullpen, Fernando Rodney is no longer a Diamondback. For all the anxiety he caused for fans, the eccentric, ageless Rodney was a fairly solid closing man for Arizona.
Replacing him, at least initially, will be Brad Boxberger, who the D-backs acquired in a trade with Tampa Bay.
Boxberger has closing experience, but other prominent bullpen arms who could vie for the position throughout the season are flamethrowing setup man Archie Bradley and newcomer Yoshihisa Hirano, who comes over after an extended career in Japan.
4. Will Robbie Ray keep developing?
Ray made his first All-Star Game in 2017, pushing Zack Greinke for the title of ace among the Diamondbacks' starters, and it seemingly came out of nowhere.
The fifth-year lefty is a strikeout machine, finishing with 218 punchouts each of the last two years, good for top-five finishes among NL pitchers in each season.
His 12.1 strikeouts per 9 innings led the National League in 2017, but his 2016 season was much rougher, giving up 9.6 hits per 9 innings and a 4.90 ERA. Will 2018 Ray be more 2017 Ray or 2016 Ray?
5. Can Goldschmidt and Greinke continue producing like all-world players?
Martinez and Ray were big-time bonus contributors last year, but the Diamondbacks still rely heavily on two veterans: Paul Goldschmidt and Zack Greinke.
After a disappointing first year in the desert, Greinke was a reliable ace for Arizona in 2017, finishing fourth in NL Cy Young voting. But at age 34, there's a chance his high-priced arm begins to break down at some point this season.
Goldschmidt isn't at that point yet. He's only 29 and he's looking for his sixth-straight All-Star appearance. Despite a bit of a September dropoff in 2017, he finished in the top three in NL MVP voting for the third time and won his third Gold Glove and Silver Sugger awards.
Expect more of the same excellence from Goldy.