The second-wicket pair stunned the Division One’s bottom team with a second-wicket partnership of 311 inside 81 overs as the White Rose closed day one on a superb 367-2 from 98 overs.
It was the club’s highest second-wicket partnership against Derbyshire in first-class cricket, beating the 305 between JW Rothery and David ‘Lucky’ Denton on this ground way back in 1910.
Lees celebrated a new contract at Headingley, announced this morning, with his second hundred in the Championship this season, and his career best following 100 during the win against Middlesex at Lord’s in early June.
The 20-year-old, who pulled fiercely throughout his innings, finished the day unbeaten on 171 from 286 balls, including 25 fours.
Jaques, 34-years-old, also pulled and hooked with authority on the way to 139 off 253 balls, including 16 fours and two sixes. The pair’s running between the wicket was also a feature of their alliance.
Adam Lyth was the first wicket to fall in the day when he edged a beauty from left-arm quick Mark Footitt behind to leave the score at 22-1 in the seventh over after Andrew Gale had won a crucial toss and opted to make use of ideal batting conditions.
The duo played some stunning shots against a Derbyshire attack who struggled to find their rhythm – off-spinner Peter Burgoyne aside.
On his Championship debut, the 19-year-old bowled an unbroken 23-over spell either side of lunch at a cost of just 42 runs, and he finished the day with respectable figures of 0-71 from 32.
Lees and Jaques, however, did not look in any trouble against any bowler, no doubt leaving their top order batting colleagues worrying about pad rash.
Lees brought up his fifty off 76 balls before Jaques, who hit the majority of 22 off a Mark Turner over in the latter stages of the morning session, brought up his off 68. They took the score to 151-1 from 29 overs at lunch.
Lees, who kept his nose in front for the majority of time in the race for milestones, later brought up three figures off 163 balls with 16 fours before Jaques off 174 with 13 fours and a six. Jaques hit his second six in the latter stages of the session, hooking Turner behind square.
After tea, the milestones continued to be reached and the records broken as Lees reached his maiden 150 off 248 balls.
Derbyshire opted against taking the second new ball until the second ball of the 88th over, the ball after Jaques edged Tim Groenewald to Wes Durston at first slip, leaving the score at 333-2.
There was good pace and carry in the pitch all day, but just the odd sign of uneven bounce. That will not disappoint Yorkshire, who will pick up a fifth batting bonus point in the early stages of tomorrow’s second day.
Gale will also resume tomorrow on nine not out following a day for the statisticians and one of Yorkshire dominance.
Alex Lees and Phil Jaques have both completed centuries to maintain Yorkshire’s dominance with the bat against Derbyshire at Chesterfield.
The left-handed second-wicket pair have shared an unbroken 263 inside 62 overs since the seventh over of the day to take their side to 285-1 from 68 overs at tea.
Lees brought up his second Championship hundred of the year off 163 balls with 16 fours and Jaques off 174 with 13 fours and a six.
The pitch has good pace and carry in it, although there was one ball from Mark Footitt to Jaques which kept very low. With a mammoth score in the offing, Yorkshire will hope to see more of that over the next two or three sessions.
Jaques hooked his second six before tea, and will resume this evening on 120. Lees is on 123.
Alex Lees has celebrated the agreement of a new Yorkshire contract in style with an eye-catching fifty during the first morning against Derbyshire at sunny Chesterfield.
Andrew Gale will have been delighted to win the toss with conditions ideal for batting – a good pitch and fast outfield. But his players had to take advantage. And that they did, reaching 151-1 from 29 overs at lunch.
The early loss of Adam Lyth, caught behind off a peach of a delivery from Mark Footitt, gave the hosts hope as Yorkshire fell to 22-1 in the seventh over, though they had very little to cheer afterwards.
Lees and Phil Jaques, who also brought up his fifty off 68 balls after Lees’s came off 76, made hay. Jaques even took the lion’s share of 22 off a Mark Turner over shortly before lunch.
They will resume their unbroken second-wicket partnership of 129 inside 23 overs this afternoon. Jaques has 61 and Lees 57.